Our friend N was divorced by his first wife because she had found someone else. They had a little three year old boy, A.
N had weekend custody, while she moved in with her lover, but when she took him to to court to finalise the separation, she dropped a bombshell that the child was her lover's and she wanted to stop N's weekend custody. He was so devastated, and her lawyer was so clever, that N just gave up.
Fast forward 20 years and A is getting married. He sees his birth certificate showing N as his father and looks him up in the phone book. N gets this call "I think you're my Dad"
They are now reunited, and clearly N is the true father because they look alike. A and his family live only 150 kilometers away from N, there are now three grandchildren, and there is lots of family interaction. A and his mother are not in contact - she rejected his wife, who is a lovely woman, so I guess the MIL is the loser. To add to the schadenfreude, when they first separated, first wife called N a loser and said her new bloke was a successful businessman. Well, his grocery business went bust and they are on the breadline.
A now knows that his Dad wanted custody at the time, but was just given outright lies. His childhood was OK though, because the stepfather was good to him - it was his mother who was the rotten so and so.