|Relatives||Serinuma Hideo (Husband)|
Serinuma Takurou (Son)
Serinuma Kae (Daughter)
Mitsuko was shown to have a chubby body however, she used to have a slim body when she was younger. In her younger years, she bear the same strikingly resemblance her daugther Kae had right now. She have been worried when Kae started holding inside her room for almost a week and had to force her son Takuro to do something about it.