It is not easy to deal with loud controlling ignorant people like this. Only your Son in Law can change things and I expect your daughter and he do not think it worth the tension, distress and arguments that any intervention might bring,.
make sure that when you are with them, without the in laws, they both enjoy your company and that you respect your daughter as the mother of you son in laws' son.
Good luck
Embarrassing problem following surgery
Friends using messages instead of picking up the phone


