In January 1705/6 Belcher married Mary Partridge, the daughter of former New Hampshire Lieutenant Governor William Partridge, an occasional business partner of his father's.
Im Januar des Jahres 1705 heiratete Belcher Mary Partridge, Tochter des ehemaligen Vizegouverneurs der Province of New Hampshire William Partridge, eines gelegentlichen Geschäftspartners seines Vaters.