My youngest son was 18 - and I had a very very difficult few years with him. Interestingly he is the one who makes most effort to reconnect with his father.
Initially it delayed his development and then it suddenly spurred him on - he has done amazingly well academically and is now engaged to a fabulous girl. What you can do is provide support, and consistency in a spinning moral world. One reason why I never dated, lived quietly and was always there for them. If one parent is wildly unstable we have to be the calm centre Not fair, but as 25years said - life isn't fair and we were not born in Africa.
