It appears from the timeline given here that Brennan may have waited until Jobs “made it big” and her daughter was as old as 4+ yrs old to file for determination of paternity and child support.[/quote]
Why should the child’s age matter? It was still his daughter, and he should have stepped up to the plate. It doesn’t matter what his relationship to the mother was like. He had a responsibility, and it’s a known fact that he tried to weasel his way out of it by lying about being sterile.