My in-laws!! HELP!

I have been married to my husband for over a year and we have been together for over 3 years, we actually were each others first love as teenagers though but lived in different states and were very young so split apart, but now we are together and happy. I have two children from a previous marriage and he has one child from a previous relationship. Ever since we got together his parents always show favoritism to his child over mine. They would send her home with new toys and nothing for my children so eventually my husband had a talk with them and it got a little better until a few months ago when my husband's step-dad got laid off work because before he had a job where he worked off shore and now he is home all the time and so when he comes over here or we go over there you can tell the huge difference in how he treats my husband's child and how he treats mine. My son and his daughter played T-ball together on the same team and his step-dad was t here at every game ALL OVER HER even at the edge of the field where she was playing cheering her on and talking to her and snapping pictures and not even acknowledging that my son was also playing. We try to act as one family because their other parents live in different states and are hardly there for them. In his parents house are pictures all over of his daughter AND even his ex girlfriend's daughter which is his daughter's older sister and both of them are in the pictures. I gave her pictures of my children and she never put them up, we gave her a picture of our family and they didn't put it up until my husband asked them about it. I'm fed up with it and I asked my husband to talk to them about it again and tell them to take the pictures down of his ex's daughter and put pictures up of my kids or I won't go back over there. He didn't tell them all of that though he said he just asked them why do they have those pictures up and they said give us some to replace them and w e will take them down.. I gave them pictures and they never put them up! I told my husband he needs to talk to them again today and tell them we will not be coming over until those pictures are down and mine are up. It hurts my feelings and makes me uncomfortable to go over there. Both of my parents have pictures of all 3 of the kids in their house and I never asked them to. His parents HAVE to accept it because we are HERE TO STAY. Please any advice or stories would be appreciated and thank you.

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