Alonzo was the ninth child of John and Alice (King) Ladd. This John Ladd, born in 1774 and died in 1897, was a son of William and Elizabeth (Vining) Ladd. Alonzo married Sarah Morse and they had two children, Alice K. and Emery. We have no further information on their descendants. He is buried in the Union Cemetery, Braman Corners, NY (also called the Duanesburg Cemetery), along with a total of 22 Ladds buried there. Also buried in this cemetery areJohn Ladd, Alonzo's father, and Lemuel R. Ladd, John's brother and Alonzo's uncle.