There should be no getting angry or getting away with the in laws basically the mother.
Here is what, anyone who at first sight or first meeting don't like or can't get along with the mother. That a huge red flag that anyone male or female, should see and immediately take care of.
There will be none of that what soever. With serious and mature adults a, they can be no reason for it . The reason would be either of you not the mother.
I am glad that you got it momster. Growing up was your practice, and experience , no get it straight before bringing handsome or pretty home to mama. Save her that which you already know, maker mama the special lady she is booth of you. Come to mama with your understanding not you differences. She's not a referee..
When a person is giving you trouble, they are automatically going to give all around you trouble , because their approach won't be correct to your family, your family don't have control over that, When you are right everything about you is right. Then come with that glowing meaningful truth to mama.