My MIL has moments... Most of the time she is fine but she can be pretty heartless/thoughtless sometimes. I have kids from a prior relationship. When I married her son, MIL and FIL told my kids to call them grandma and grandpa. I thought that was great. Fast forward a year and now it's made clear on almost every occasion that they are not 'grandkids'. We had a get together and there was one picture with everyone and then a second picture... without me and my kids. I avoid MIL house for Christmas because my kids are not treated the same and I would hate to have them see it. On one occasion there was even a facebook post about how she loved her [number] of grandchildren and that number was the exact number of grandkids minus my kids... I have asked my husband to say something but he won't. It's one thing to be a jerk to me but it's another to do these hurtful things to children. The kids just love MIL and FIL, they are too young to see it yet. I don't want to say something and make it worse. Ugh.