Child support

Okay so I have a question... nobody get offended here please!

If a guy who pays child support and purchases all the extras on top of that... like the essentials. Clothing, shoes, hair cuts... you get the point. Anyways should the mom also be asking the ex’s (father) side of the family for groceries as well?

Personally I feel like between the split up parents.. what has to do with the child financially should be dealt with between them... considering she has more than enough money to buy groceries 🤔