Schell book by Denison gives birth date as 07 Oct 1770, Stone Arabia Church Records at ancestry have:
Born 22 September 1770
Baptized 10 October 1770
as Johann Henrich Schell with twin Marcus
at Stone Arabia, Herkimer, New York.
Note: Henry Lutz, listing above theirs, has baptism 07 Oct 1770 and birth as 21 September 1770

Henry and Mary married on 13 April 1794
at Schell's Bush, Herkimer, New York.

They were the parents of eight children;
Elizabeth, Henry, Abraham, Jacob Thomas, Susanne, Solomon, Fanny, Daniel.

Henry died at the residence of his son, Daniel.
Henry and Mary are recorded in the 1852 census at Ingersoll, Oxford County, Ontario
dwelling in the household of their son, Daniel.

Henry Schell moved in 1798, to "Nellis Settlement," at the "forty miles creek" in the township of Grimsby, between Hamilton and Niagara. One or two years later, he moved to Markham, Ontario, 24 miles North of Toronto.

SCHELL'S BUSH - Herkimer County, New York:
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Henry and his twin brother, Mark, were nearly eleven years old when they were captured and taken to Canada by the Tories and Indians; the boys and savages got along very well together and became quite attached to each other; the lads learned the Indian language. They were, and remained, the friends of the Indians during the rest of their lives.
When Henry and Mark had settled in Upper Canada, any Indian who appeared in their neighborhood received their hospitality.
During their captivity in Canada they lived for the first two years under the command of General Murray in Quebec.
The twins, showing themselves bright young men, then attracted the notice of Captain Laws, an officer in the British army. By some negotiation he got them away from the Indians and kept them under his own supervision and care for the next six years.
Mark was placed out as an apprentice to learn the tailoring trade. Henry became the favorite of the Captain and was his companion in his various journeys.
Captain Laws received a commission from England to establish and lay out a town site
at Bay Chaleur. He selected his party for this arduous undertaking, which required sturdy and hardy men. Young Henry Schell was not thought unfit to accompany the Captain in
this difficult expedition but his presence was desired more to furnish agreeable company. They started from Quebec, by vessel, in the fall of 1784 or 1785. The weather had been fine that fall up to November. They made a
late start, thinking that they would be able
to reach Bay Chaleur before the winter set in. They had not been out many days, when the weather changed and it rained and then turned colder; it snowed and froze hard enough to form a great amount of ice on the rivers. They drifted around through slush and ice for three weeks. About Christmas the weather moderated; they forced their way through the ice, and finally in the winter they reached their destination in Bay Chaleur. They effected a landing and went to work to build cabins to have shelter for the party. After this, Captain Laws and Henry returned to Canada.
The Captain had a great affection for young Henry, and wanted him to remain with him and establish himself under his protection. But Henry and Mark had been away from home already eight years, and as they grew older, they became more homesick. Henry would have accepted readily the offers of Captain Laws; but he liked to see his dear mother once more before making a decision. The more the twins conversed with each other about their family and friends, the more they longed to return home. They did not fear the distance; the country was at peace. Their ingenuity would furnish them the means to reach their destination.
They decided to undertake the journey, and bid farewell to their Canadian friends. To defray the expenses of their long journey, they furnished themselves with pins, needles, and trinkets to sell along the way - which had to be traveled entirely on foot. It did not take long to accomplish their journey, for they did not linger on the way. The attractions of Schell's Bush furnished them speed on their march.
But what a change! The old home seems not the same - the large blockhouse was not there. Their mother has grown older; and where is their father? Denis is missing - Fred
is lame - Eve is deformed. But after all the afflictions and calamities, the Schells rejoiced in meeting the twins who had been given up for lost or dead, have returned! The suddenness of delight mixed tears of joy, many smiles, and laughs of bliss. Their too recent misfortunes are for awhile forgotten. All the neighbors soon appeared to welcome Henry and Mark home. The boys of the neighborhood fill the yard and cannot get through shaking hands with their former playmates: the girls also crowded around Henry and Mark, and marvel at their noble countenance and manly bearing. The twins feel that the Mohawk Valley is the happiest place on earth. After joyful demonstrations of the happy reunion, the events, occurrences and incidents of both sides have to be told and retold. The losses and afflictions have to be lamented again. The death of their father and brother is again cause for mourning. Wounds already healed are reopened. Hardship and suffering cause again a shuddering. Brave deeds of the war make again their bosoms swell. The losses of the neighborhood are recounted and pitied. Anger rises in their breasts at the traitorous Tories: a sigh is heaved at the remembrance of the war. All are thankful that the bad times are over and that there is a happy reunion in the Schell family.
When Henry married Mary Moyer in 1794, a division of goods was made. Henry retained the homestead. Several of the family had moved to Canada and in the spring of 1798, Henry sold the homestead and moved to Canada. He settled between Hamilton and Niagara, at a place now called Grimsby in Lincoln County. A year or two after that he moved to Markham in York County, Ontario - near the home of Mark Schell.
The twins always sought each other's company. A great affection always existed between the them.
Henry, at age 75, upon hearing of Mark's accident, walked from Ingersoll to Wentworth to see his dying brother.

1803 census Markham, Canada West, Canada
Fourth Concession No. of Lot 28
Head of Family: Henry Schell 35
Wife: Maria 28
Sons: Henry 5, Abraham 3, Jacob 1/2
Daughters: Elisabeth 8