maccracken married edith constable in 1910. maccracken's father-in-law, frederick augustus constable, managed arnold constable & company in new york, and he was the son of one of the store's original partners. maccracken's daughter louise married robert olmsted, a trustee of vassar college and the namesake of the school's biological sciences building. his son constable was a graduate of harvard university and columbia law school.