My further response:
The purposes of child support money ebbs and flows like the tides. Basically, child support is for "necessaries of life" (food, clothing, shelter, etc.) But, like the tide, these things change as the child gets older, and in step with the child's "station in life"; e.g., a rich child's "necessities" are different from that of a child from a middle class or poor family.
One other point. You seem to be asking about "control" of the money; e.g., "can I dictate how that child support money is spent?" The answer to that is simple - - no. Once that money is in Momma Bear's hands, it belongs to her and now that money "is hers". As long as the child is receiving the "necessaries of life", then no one can argue the point of "where is all that money going?"
IAAL