Michael- Didn't go get his son after he healed, he let him be adopted. When he did get his son forced back on him by Walt's adopted Dad Brian, he was going to have his grandma take care of him.

Sawyer- When he found out he had a daughter, he chose not to be a part of her life (but that may be because he was afraid of hurting her) but did set up a trust fund for her.

Ben- Stole his child, Alex, from her mom Danielle.

Ben is not Alex's father. Danielle is her mother, but in no way is Ben, Alex's father.

(All of the cast members have bad fathers, you would be better off trying to list the ones that had good fathers.)