Disowning a child is not a legal concept, and there are no rules. Commonly, people refer to a parent writing an adult child out of his/her will as disowning a child. In this case, yes, the parent could write them out and write them back in again as often as they want.
No, they have to be told.
Yes. You just have to write in your will that your adult child gets NOTHING.
In most countries, parents cannot legally disown their adult child in the sense of completely severing legal ties, such as disinheritance. However, parents can choose to have no contact or relationship with their adult child, which is not the same as disowning them in a legal sense.
no
It would be best to consult with a family law attorney in your jurisdiction to determine the specific legal documents needed to disown your adult child. The process can vary depending on the laws in your state or country.
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.