The issue with how Geni.com lists the ancestors of Nathan Fiske is the ages of his parents when Nathan was born. It has Nathan's father Geoffrey as age 34 when his first (Samuel) of 11 kids was born. Nathan was the tenth child. Thus, Geoffrey was age 50 when his last child was born. His wife was anywhere from 3 to 10 years younger than Geoffrey. 
Other sources list the ancestors of Nathan withsimilarities and differences: 
geneanet.org lists [https://gw.geneanet. org/rwmoore?lang=en&pz=reagan+wentworth&nz=moore&p=geoffrey&n=fiske] Nathan (1595-1676) as son of Geoffrey (1552-1629) and Mary Cooke, Geoffrey son of Robert (1521-1602) and Sybil Gould. This aligns with Geni.com except for the birth year of Nathan. 
Wikitree.com lists a different set of ancestors than Geni.com [https://www.wikitree.com/wiki/Fiske-253]. It has Nathan (1614-1676) son of Nathaniel (1602-1676, age 12 when son born and died on the same day as son) and Dorothy Symonds, Nathaniel son of Nathaniel (1574-1642) and Alice Henel, Nathaniel son of William (1560-1623, brother of Geoffrey that Geni.com has as the father of Nathan) and Anna Anstye, William son of Robert (1566-1623) and Sybil Gould. From that point, the ancestors match Geni.com. 
FindAGrave.com [https://www.findagrave.com/memorial/41288789/nathan-fiske] lists that ancestors of Nathan similarly to WikiTree.com: Nathan (1615-1676) son of Nathaniel (1594-____) and Dorothy Symonds, Nathaniel son of Nathaniel (1574-___, died at sea between 1640-1650) and Abria Hovel, Nathaniel son of William (1550-1623) and Anna Antstye, William son of Robert (1521-1600) and Sybil Gould. From that point, the ancestry agrees with Geni.com and WikiTree. 
Because of Nathaniel's age when the children in Watertown were born, there is some speculation that Nathan and his sister Martha were grandchildren of Geoffrey and Mary Fiske, based on the Candler manuscript saying that Nathaniel's children went to New England, not specifically Nathan. However, this supposition is contradicted by several facts (Martha and her husband are both explicitly named as daughter and son-in-law in her father's 1629 will), and Martha's age at death of 82 in 1684 agrees with the baptism in 1602 of Geoffrey's daughter Martha. And since Martha lived with Nathan, and testified he was her brother when she testified that he "was very crazy in his memory", that would make Nathan also a child of Geoffrey's and rule out any intermediate generation. 
Rootsweb.org states his death year as 1676. However, his will in Watertown is decades later. 
What is more likely is that the estimate of Nathan's birth is off. Sources list it anywhere from 1595 to 1615. The only evidence for Nathan's birth is that he is listed in the Candler manuscript after Samuel (the eldest son, born circa 1586) and before David, and all that can be said with certainty about David is that he was old enough to be co-executor of his father's will in1629, so born by 1608, though his birth is usually estimated earlier, around 1601.

Historical
1616: England - William Shakespeare dies
1616: Spain - The last remaining Moriscos (Moors who had nominally converted to Christianity) in the Spain are expelled
1618-1638: Germany - The Bohemian Revolt precipitates the Thirty Years War which devastates Europe in the years 1618-1648
1618: China - The Manchus start Invading China, their conquest eventually topples the Ming Dynasty
1618: Romania - Bethlen Gabor, Prince of Transylvania, joins Protestant Rebels
1619: Austria, Romania - Bethlen Gabor is defeated outside Vienna
1620-1621: Poland, Turkey - Polish-Ottoman War over Moldavia
1620: Poland - Battle of White Mountain, Emperor Ferdinand II, Holy Roman Emperor, defeats the Bohemian rebels
1620: Romania, Turkey - Bethlen Gabor allies with the Ottomans and an Invasion of Moldavia takes place, the Polish suffer a disaster at Cecora on the River Prut
1620: United States - The Puritan Pilgrims arrive in the Mayflower at Cape Cod
1621: Poland, Turkey - The Battle of Chocim Poles and Cossacks under Jan Karol Chodkiewicz defeat the Ottomans
1621: United States - The Pilgrims celebrate the first Thanksgiving with their Indian neighbors
1622: United States - Jamestown massacre Algonquian natives kill 347 English settlers outside Jamestown, Virginia (a third of the population of the colony) and burn the Henricus settlement
1623: Italy - Maffeo Barberini is elected Pope Urban VIII at the Papal conclave of 1623
1624-1642: France - As chief minister, Cardinal Richelieu centralises power in France
1625: United States - New Amsterdam founded by the Dutch West India Company in North America
1626: Italy - St. Peters Basilica in the Vatican completed
1626: United States - The Dutch buy Manhattan Island for $24, a presence is established but no large settlements made
1627: France - Cardinal Richelieu lays siege to Protestant La Rochelle which eventually capitulates
1629: France - Cardinal Richelieu allies with Swedish Protestant forces in the Thirty Years War to counter expansion by Ferdinand II
1631: Italy - Mount Vesuvius erupts near Naples
1632: germany - Battle of Lutzen (first of two), death of king of Sweden Gustav II Adolf
1633: Italy - Galileo Galilei arrives in Rome for his trial before the Inquisition
1633: United States - The city of Baltimore is settled
1634: Ethiopia - Emperor Fasilides expels the Catholic Patriarch Afonso Mendes and several Jesuit missionaries from Ethiopia
1634: Germany - Battle of Nordlingen (first of two), in Bavaria, results in Catholic victory
1636: Ethiopia - Emperor Fasilides founds the city of Gondar, which becomes the capital of Ethiopia for the next two centuries
1636: United States - Harvard University is founded in Cambridge, Massachusetts
1636: United States - Roger Williams is driven from Puritan Massachusetts and settles Rhode Island, a haven for religious freedom
1638: United States - Delaware is settled by Peter Minuet
1639-1651: England, Ireland, Scotland - Wars of the Three Kingdoms, civil wars throughout Scotland, Ireland, and England
1639: Italy - Disagreements between the Farnese and Barberini Pope Urban VIII escalate into the Wars of Castro and last until 1649
1639: Spain, England - Naval Battle of the Downs, Republic of the United Provinces fleet decisively defeats a Spanish fleet in English waters
1639: United States - John Wheelwright is banished from Boston and founds a colony in New Hampshire
1640-1668: Portugal - The Portuguese Restoration War led to the end of the Iberian Union
1640: England - Torture is outlawed in England
1640: Scotland - King Charles was compelled to summon Parliament due to the revolt of the Scots
1640: United States - The population of the American Colonies is estimated at 5,700. Starting in the 1990's, Charles Anderson of the New England Historic Genealogical Society begins books that provides information about all persons in New England by 1640.
1641: France - Rene Descartes publishes Meditationes de prima philosophia Meditations on First Philosophy
1641: Ireland - The Irish Rebellion
1641: Japan - The Tokugawa Shogunate Institutes Sakoku, foreigners are expelled and no one is allowed to enter or leave Japan
1642-1649: England - Civil War in England, Charles I is beheaded by Cromwell
1642: England - Isaac Newton is born
1642: Neatherlands, New Zealand - Dutch explorer Abel Janszoon Tasman achieves the first recorded European sighting of New Zealand
1644-1674: Mauritania - The Mauritanian Thirty-Year War
1644: China - The Manchu conquer China ending the Ming Dynasty, the subsequent Qing Dynasty rules until 1912
1644: Italy - Giovanni Battista Pamphili is elected Pope Innocent X at the Papal conclave of 1644
1645-1669: Turkey, Italy - Ottoman war with Venice, the Ottomans Invade Crete and capture Canea
1645: Japan - The death of Miyamoto Musashi, legendary Japanese Samurai warrior of natural causes
1647-1652: Spain - The Great Plague of Seville
1647: Turkey - Seven-year-old Mehmed IV becomes Ottoman sultan
1648-1653: France - Fronde civil war in France
1648-1667: Poland, Lithuania - The Deluge wars leave Polish-Lithuanian Commonwealth in ruins
1648-1669: Turkey, Italy - The Ottomans capture Crete from the Venetians after the Siege of Candia
1648: Spain, Italy - The Peace of Westphalia ends the Thirty Years War and the Eighty Years War and marks the ends of Spain and the Holy Roman Empire as major European powers
1649-1653: Ireland - The Cromwellian conquest of Ireland
1650: United States - An estimated 40,000 people are living in the American Colonies
1652: England, Netherlands - Anglo-Dutch Wars begin
1652: South Africa - Cape Town founded by the Dutch East India Company in South Africa
1654-1661: Turkey, Albania - Mehmed Koprulu is Grand Vizier
1655-1661: Sweden - The Northern Wars cement the rise of Sweden as a Great Power
1658: India - After his father Shah Jahan completes the Taj Mahal, his son Aurangzeb deposes him as ruler of the Mughal Empire
1660: England - Royal Society of London for the Improvement of Natural Knowledge founded
1660: England - The Commonwealth of England ends and the monarchy is brought back during the English Restoration
1661: China - The reign of the Kangxi Emperor of China begins
1661: India - Mehmed Koprulu dies and is succeeded by his son Ahmed
1662: France - Jacques Aymar-Vernay, who later reintroduced Dowsing into popular use in Europe, is born
1663: France - France takes full political and military control over Its colonial possessions in New France, microscope of Hooke discovers cells
1663: Turkey, Austria-Hungary - Ottoman war against Habsburg Hungary
1664: England - Forestry book by John Evelyn called Sylva is published in England
1664: Hungary, Turkey - Battle of St. Gotthard (first of two), count Raimondo Montecuccoli defeats the Ottomans, the Peace of Vasvar is Intended to keep the peace for twenty years
1664: United States - British troops capture New Amsterdam and rename It New York
1665: England - The Great Plague of London (aka. Bubonic Plague, Black Death) kills 70,000 people
1665: Portugal, Congo - Portugal defeats the Kongo Empire
1666: England - The Great Fire of London burns most of the city
1667-1668: France, Netherlands - The War of Devolutionm France Invades the Netherlands, the Peace of Aix-la-Chapelle (1668) brings this to a halt
1667-1699: Turkey - The Great Turkish War halts the expansion of the Ottoman Empire into Europe
1668: Spain, Portugal - Peace Treaty of Lisbon between Spain and Portugal recognizes Portugal as Independent country
1669: Turkey, Crete - The Ottomans capture Crete
1670: Canada - The Hudson Bay Company is founded in Canada
1672-1673: Turkey, Ukraine - Ottoman campaign to help the Ukrainian Cossacks, John Sobieski defeats the Ottomans at the second battle of Khotyn (1673)
1672-1676: Poland, Turkey - Polish-Ottoman War
1672-1678: France, Netherlands - Franco-Dutch War
1672: Belgium - Lynching of Johan de Witt and his brother Cornelis de Witt in the Hague, William III of Orange takes power
1672: Netherlands, France, England, Germany - Rampjaar in the Netherlands, combined attack by France, England and two German states on the Republic of the United Provinces
1674: England - The Treaty of Westminster ends the war between England and the Republic of the United Provinces
1674: India - Maratha Empire founded in India by Shivaji
1676-1681: Russia, Turkey - Russia and the Ottoman Empire fight the second (of ten) Russo-Turkish Wars, Turkish victory
1676: Poland, Turkey - The Treaty of Zurawno brings Polish-Ottoman hostilities to a halt
1676: Turkey - Kara Mustafa becomes Grand Vizier