By adult child I assume you mean 18 and over...soIf an adult child(18+)(That is not mentally disabled) deliberately and knowingly hits a parent then the parent should call the police and have the...
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.
You cannot disinherit a minor child. An adult child can be disinherited in most jurisdictions. However, you should check the laws of your jurisdiction to make certain it is done correctly. Many...