My mother is making me give her $100 of the child support I'm receiving for my son next month

I'm wondering, is she trying to take advantage of me? She's always taking money from my brothers and I. Then just spends the money on toys for my son (he's only 4 months and she has toys that will last him until he is like 10) I think she's starting to become a hoarder. I wish I could buy my son toys but she's already gotten all the toys you can think of. 
I'm also tired of her taking money from me. 

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