Thomas married Harriet Hosmer and had one daughter, Harriet Lane Hillhouse.He then married Ann Van Schaick Ten Broeck and had 4 additional children:Sarah Ann, Thomas, John, and William - all good Hillhouse names!
Harriet married Cornelius Schuyler and had 8 children.
Sarah Ann married Amos Stone Perry and had 7 children.
Thomas married Harriet Prouty and had 6 children.
John married Catherine Van Vranken and had 3 children.
William married Cornelia Lawrence Hillhouse, daughter of Cornelia Lawrence and James Abraham Hillhouse.They had no children.He next married Frances Julia Betts and had 3 children.