Thanks for all the responses! I really appreciate it!
My stepson is the oldest boy, and first grandchild. That could be why.....but yet they treat dh's sisters kids just fine too...so I have no clue.
It could be a DIL issue. I know they despised dh's ex though and have always said they were glad I was part of his life and to get him back into church and to quit drinking. She was not so great a person to dh and did some awful things to him and his family. However, I do get along with her for my ss's well being. Things are very peaceful now between us though. Maybe they are resentful of that?

They are at peace with her too though (yet they do trash talk her at times and dh has asked them not to). I do know they may have an issue with the fact that after dh's divorce, every weekend he'd go and stay at one of the sisters house and he'd have ss there on his visits. They loved being able to tell dh what to do, even down to the clothes he wore and having him on hand to do things around their house (they have lazy dh's who really don't help around the house, just sit and watch tv all day long). Since I came in the picture, they lost that and dh's dad (his parents are divorced) said that they may be intimadated by me because I am goal oriented, have a great job and always on the go type person. They (sisters and mom) are more the "meek and mild" housewives types who cater to their dh's. They do treat me nice when I'm around, but when out of sight, it's out of mind!
I think what we will do is just remove ourself from it all and only visit for short periods and make sure that no favorites are played and just leave the minute that we notice anything. Sometimes they are good and interact with all the kids, but it's the subtle things that they do that is just........
It's been great to just vent about it. I don't want to really get in to the discussion with dh a whole lot. He vents, I just tell him to pray about it and let it go cause we really can't change them. I don't want to let him know how hurtful it is or let my words be the thing that helps drive a wedge between him and his family.
But at the same time, I'm not going to let it hurt my children either. I already came up with one Christmas gift for them, a calendar, with all 3 kids pictures on each page! lol