Lyric discussion by Necrolotu 

Cover art for No Son Of Mine lyrics by Genesis

If you don't want the father to be the bad guy, the song could just mean a run away, rebellious son. He was going through standard teen issues and decides to run away. The mother crying is just her disappointed with her son, probably because he has been in trouble. The father just refuses to accept the son back for abandoning the family and running away from his problems.