One sentence using the word disown could be:
"If you don't raise my grandchildren "properly", I'll disown you!"
you gotta disown that truck
I would disown my son if he were a murderer.
One sentence using the word disown could be: "I'll disown you if you ever use bad language!"
Jacob knew that his father would disown him, if his father ever discovered that Jacob wanted to become an actor, so Jacob decided to change his last name.
The only way you can disown a wolf is to kill it.
You cannot disown inheritance, but you can refuse to accept it. This is called renunciation or a disclaimer.
Your mother is not considered a natural heir, as you are expected to outlive her. And there is no need to 'disown' a child, you simply have to name them and say they don't get anything.
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.
disown
Disinherit, disown
possession
He threatens to disown Juliet because if he doesn't she might not marry Paris and then his reputation will be ruined.