I would schedule a marriage counseling with your husband so you can talk to him In front of a 3rd party. You tell him How serious this is and it’s not a joke. You tell him if your FIL ever makes another comment you will not allow him in your house ever again. He need to make this clear to both his parents. They are so used to these comments that they don’t see anything wrong with it. It’s not an arguement to be had with his dad, it’s his dad needing to stfu. If these boundaries get broken you tell him you will file for divorce. He doesn’t think it’s serious, make it serious. But if you already want to divorce then just do that
I would schedule a marriage counseling with your husband so you can talk to him In front of a 3rd party. You tell him How serious this is and it’s not a joke. You tell him if your FIL ever makes another comment you will not allow him in your house ever again. He need to make this clear to both his parents. They are so used to these comments that they don’t see anything wrong with it. It’s not an arguement to be had with his dad, it’s his dad needing to stfu. If these boundaries get broken you tell him you will file for divorce. He doesn’t think it’s serious, make it serious. But if you already want to divorce then just do that