John Graves Simcoe and his wife Elizabeth had four children: Francis Gwillim Simcoe, Henrietta Maria Simcoe, Katherine Simcoe, and Eliza Simcoe.

John Graves Simcoe died on October 26, 1806 at the age of 54.

John Graves Simcoe was born on February 25, 1752 and died on October 26, 1806. John Graves Simcoe would have been 54 years old at the time of death or 263 years old today.

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John Graves Simcoe built two streets. Dundas street, and Yonge street, and Spendina street. He built these for Military purposes, and not for the amusement for the crowd to walk without being tripped by trees lying ominously on the street, or the merchants to walk with their carriages.