I empathize with all of you.
My MIL and FIL are pure evil. MIL and FIL would say the most prejudice things about my family and even their own ONLY when I was around.
My kids are bi-racial. (White and Asian) My kids have blond hair, brown eyes and white skin. I've heard enough Asian slurs from them to last a lifetime. She sent my kids dark skinned dolls and said "Now you have dolls that look like you." When my DH said "They don't look anything like them. They're not Black." She said to me "Of course they do. They look just like You people."
DH didn't believe me for years until one day he pretended to leave and came back in to witness it for himself. It was frightening to see how quickly her face went from nasty Harpy to stunned smiling granny. She actually said "I was just telling Jenn how wonderful she was when you came in." DH said "I heard everything...everything. Stop your lies." She continued to deny everything when caught even putting her arm around me for emphasis. If you had seen how quickly her face changed you would understand just how much of a professional she was at lying. Lying came natural for her and she seemed believable even to me.
FIL is just as evil...he was nicer the last few years and I found out he was suffering from debilating memory loss and doesn't have much time left to live. The man was such an SOB but only due to his disease FORGOT to be mean . I suppose he forgot I was Asian somewhere along the line too. He started to say "Those people..." instead.
My DH knows now but he doesn't have the strength to fully stand up to his parents even for us. This is the true problem for all of us. If any of them could MIL & FIL would not be a problem but just an awful memory of a bad experience.
I wish everyone luck but I realize we are all in a bit of a no win situation. If someone were mean to us or our children we would have told them to piss off long ago. We love our respective DH(s) and only out of respect to them we tolerate the BS that his parents have put upon us. It would be easy to tell them off otherwise. Its not like I respect them. If DH could have told them off from the beginning I would never have had these problems.
I told DH....you'd better live a long life....because if you die, your parents will hear everything I have wanted to say to them from day one and it'll be only as pretty as they have been.