Feeling like my MIL plays favorites

Because she does. I'm trying not to be selfish but even my kids feel like she loves their cousin more and my husband refuses to talk to her about it. My husband's cousin is 14. My kids are 12, 8, 7, and 5. Also they're all girls. The only girls in the family. Their cousin is my BILs kid. I know that cousin has been through a lot. My BILs baby momma dipped out when he was 2, and 4 years ago my BIL got murdered in front of the cousin. BIL left in his will that his son would go to his fiancè and she was horrible. Blew through all the life insurance money. Was having drugs and random men in the home and their cousin suffered a lot of abuse. Me and my husband reported it and tried to help get him out of there and we luckily did. He lives with my husband's parents now. I understand he's been through a lot. He's been in therapy. My husband drives him some days and he's over our home a lot. But oh my God my husband's parents, mainly his mom, spoils the ever loving shit out of him. This kid gets whatever he wants. Everything he has is new. I understand he went through so much trauma and I understand why for the last 4 years they've tried to give him a good life. But when you give your grandkids 2 gifts a peace while giving your other grandchild like 40 gifts that can make them feel shitty. At Christmas there were gifts around the whole tree. When my daughter turned 12 my in laws gave her $100 and some new clothes which she's so appreciative of. But then you're taking your other grandchild out to an expensive steal restaurant. Letting him get the biggest steak, while giving him $100 and a whole Xbox. My husband doesn't really care. I do because it does make my girls feel some type of way. Especially when I've heard of family preferring boys over girls. Am I being selfish?