My son is 8 years old. Me and the man he knows as dad got together when he was four months old. My son has not seen the sperm donor since he was a few weeks old due to domestic violence, and he was put in prison for threatening us both with a knife. He never tried to attempt to have any contact with him through court, and he has been raised by my husband as long as he can remember. The sperm donor is however on his birth certificate and one day I know I need to tell him. When is the right time to do this? Too young he might not understand- too old might cause him issues in future life so I just don’t know when or how to tell him. Any advice appreciated :)