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A parent can get the medical records of an adult child if the adult child gives express permission.
Is this a trick question? If the child is legally an adult (and therefore 'emancipated') then there is no "custodial" parent.
No, the child can not. The other parent could before the child was an adult. The money goes to the parent to use for the child and not directly to the child.
extremely unlikely
No. The custodial parent is/was the obligor, not the child.
No, they are not.
Only if you prove to be an "unfit" or bad parent. The parent that is an adult has not more rights to the child because they are an adult and you are not.
No, the filing period ended at age 18 for the parent, and age 19 for the adult child.
Only if the parent is the legal guardian of the child's person. If the child is a danger to herself or others, the parent can petition the courts for involuntary commitment.
No. Visitation and child support are 2 separate issues and the child (although now adult) does not have to see the parent. The parent is always obligated to support the child anyway. Child support usually stops from age 18 though but in some states it can be prolonged when the child is in college.
No, child support is not paid to the child but to the parent raising the child.
No. What you suggest is not possible.