As an alienated more grown-up child, you may begin to think for yourself, discover something’s wrong, talk to others, read things that make you aware of what has happened to you. You may look for your other parent on social media. Google and read all you can about Alienation. You may need friendly or professional support to help you work out what to do. You will want to find the truth. That may include making a new relationship with your rejected parent. It may mean distancing from your close parent, at least while you develop your understanding of the situation.