I’ve been married twelve years, and I’m still having problems with my mother-in-law. When she comes to my home, she feels that I should leave my bedroom so she can talk privately with my wife. They close the door to my bedroom, and that makes me uncomfortable. I’ve explained to my wife that they need to discuss these things at dinner, not in my home where I feel put out.
First of all, nobody should be alone with your wife behind a closed door in your bedroom. It does not matter who it is. Nobody. That is the sanctuary of your family and your home. You need to be the leader of your home and make sure you’re protecting your wife from her mother.
You need to take charge of your home. Take charge of that situation and kindly ask that they refrain from doing that because you won’t have that in your home. Let them talk openly.
Anything hidden will come to light. What is there to hide? What is there that needs to be talked about privately with your wife outside of your involvement? All matters should be disclosed between a husband and a wife. If there are private things now, there will be worse private things later. I would steer away from that.