If a parent desires to disinherit an adult child many states require that the child be specifically mentioned in the will. Otherwise the court will rule that the testator forgot to mention that child (which sometimes happens) and provide them with the share they would have received it there was no will.
This is one reason a will should always be drafted by an attorney who specializes in probate law in your jurisdiction. That way the will will meet the requirements for a valid will and will not be vulnerable to challenges.
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.
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, the filing period ended at age 18 for the parent, and age 19 for the adult child.
No, child support is not paid to the child but to the parent raising the child.
No. What you suggest is not possible.
no