The angrier you get, the more likely it is your fault. If you’re not the angry one, that is a good sign. Very arrogant of me to give you advice without any other context, but find something y’all can agree on and focus on that.

Whenever a disagreeable topic arises, shut it down with “you might be right” then don’t engage.

If they truly believe that you are open to them being right on whatever it is, that may be enough to thaw relations. Someday it may even open them up to you being right.