Furthermore, according to the description of "Kansei Choshu Shokafu" (a record of family trees of samurai warriors of Edo bakufu) in the section about the Sakuma clan (a family of the Miura clan), Tomomori was adopted by his relative, Iemura SAKUMA, escaped to Okuyama-no-sho estate in Echigo Province, and later moved to Gokiso-mura, Owari Province.
また、江戸時代の『寛政重修諸家譜』の佐久間氏（三浦氏一族）の項の記述によれば、親族の佐久間家村の養子となり越後国奥山荘に逃れ、その後尾張国御器所に移り住んだと記述されている。