Mary did not marry.
Avery, and probably Lydia too, resided in Brooklyn, NY.
If Isaac's birthdate and that of his next younger sibling George are correct, then their birthdates are only 8 months and 2 days apart. It is likely that one or both birth years are incorrect.
Isaac fought in the Civil War, losing a leg and receiving a Medal of Honor. He attended Hobart College.
George left Columbia College to join the Army, in the service of which he made a career. He fought in the Spanish-American War and World War I. He is buried in Arlington National Cemetary.
If George's birthdate and that of his next older sibling Isaac are correct, then their birthdates are only 8 months and 2 days apart. It is likely that one or both birth years are incorrect.
George, and perhaps Cora too, resided in Apalachin, NY, then New York City, and finally in Owego.