After his father's death, Hisamoto relied on Tokinao AKAI, his father's younger brother and a Hatamoto (direct retainer of the shogun) with 1,500 koku, and Hisamoto was brought up in Inukai-mura, Uchi-gun, Yamato Province.
久基は父の死後、父の弟で1500石の旗本の赤井時直を頼り、大和国宇智郡犬飼村で養育された。