“I would sit down with your partner first, not your mother-in-law, because the boundary has to live between the two of you before it can live anywhere else. I have seen too many families where one parent stays quiet to keep the peace and the other slowly simmers until it explodes sideways.”

“I would start with your partner, not your mother-in-law. In my office, I see couples get stuck because one person is avoiding a hard conversation and the other ends up looking like the villain. You and your partner need to agree on what is acceptable before anyone changes the locks. If you present a united front, the boundary stops being you versus her and becomes the two of you protecting your own family.”

“I see this most clearly as a boundary between you and your partner first, not you and his mother. The key and the kitchen are fixable only once he agrees the two of you get to decide who enters your home and how your baby is fed.”

“The real issue is not your mother-in-law. It is that your partner would rather let you be overridden than risk discomfort with her. I would start there, with your partner, before changing the locks. Ask what easier is costing the two of you as a parental team, because that cost adds up fast.”

“The real boundary isn't with your mother-in-law first, it's with your partner. I see this pattern often: one spouse wants to avoid conflict so the other spouse absorbs the invasion, and the marriage slowly becomes the place where one person's family gets priority.”

“The boundary you need is not with your mother-in-law first; it is with your partner. In my work with separating and intact families, the couple’s united front is what keeps a grandparent from becoming a third parent.”

“I would start with your partner, not your mother-in-law, because the boundary you need is really about the two of you running your own home. In my work with couples, the person who says just let it go is often avoiding a different conflict, and that avoidance becomes its own problem.”

“The real problem is not your mother-in-law, it is the That’s not what she meant dance between you and your partner. I see couples fall into this constantly: one person tries to keep peace by dismissing the other’s hurt, and the hurt partner ends up feeling alone and unheard.”

“I would change the lock and tell my partner first, not as a negotiation but as a fact: our home is our child's first sense of safety, and the sitter needs one clear authority. The boundary is not between him and his mother; it is between our family and everyone else.”