William, Anna Marie (Kemp) Simpson had Henry Gordon 1865, Montreal

Henry Gordon Simpson was born in Montreal, May 22, 1865. He was the son of William Simpson and Anna Marie Kemp who were married in Montreal, 1851.
Henry married Effa (Ethel Frances) Eldridge, who was born in Monson, MA 1866.
Their daughter Ethel M Simpson married Malcolm C Ross in Massachusetts, where the couple lived and died. Ethel and Malcolm were my grandparents.
Henry Gordon Simpson died in Boston September 27, 1890 of typhoid at age 26. I believe he was a mild hemophiliac.
There were plenty of years after William and Anna Marie were married for them to have other children. I'm looking for any of them and their progeny. Also looking for information on William and Anna Marie (Kemp) Simpson.

Thanks!
Paula