Kunishige DATE, who was the fifteenth head of the Watari-Date family, contributed to building Date-mura Village in Usu-gun County (present-day Date City in Hokkaido) and was therefore raised to Baron, was his younger brother by blood.
亘理伊達家十五代で有珠郡伊達村（現・伊達市(北海道)）開拓に功があり男爵となった伊達邦成は実弟にあたる。