"You can’t say no to your wife, can you?"

Mrs. Yuigahama is the mother of Yui Yuigahama.

Mrs. Yuighama seems to be a kind, lenient and friendly woman being mostly like Yui Yuigahama herself. They often make similar facial expressions.

The surname Yuigahama means "reason, case, cause" (由) (yu), "comparison" (比) (i) and "beach, seashore" (浜) (hama).

Mrs. Yuighama already knew Hachiman Hikigaya by his nickname "Hikki", mentioning how Yui Yuigahama is always talking about him causing Yui to become highly embarrassed and push her out of the room.

She also recognized Yukino Yukinoshita as "Yukinon" and asked Yui if she is required to prepare the futon for Yukino for the night stay, indicating that Yui freely talks to her mother about her daily basis. Yukino is openly envious of Yui's free relation with her mother.

(She has been your wife for over 12 years so be a real one and try those cookies 🍪)