Twice. He was married to Grace Gallatin, sometimes known as
Grace Thompson Seton, author of A Women Tenderfoot, Nimrod's Wife
and a number of travel-oriented books. They had a daughter Ann who
became a best-selling author of historical fiction in her own
right, using the pen name Anya Seton. After they divorced and Seton
relocated from Connecticut to New Mexico, Seton married Julia M.
Buttree, who was also the author of a number of books. They adopted
a daughter, Beulah, who was later known as Dee Seton.