I find it hard to believe the man who fathered six children, well, now seven children could not remember who the girl's mother was. He's now divorced as well as estranged from all six of his children by different mothers. Oh, make that seven, in fact. OK, he was shagging around and partying without contraception or thought for the consequences.
As a PP has said, did his new found daughter's face not jog his memory ?
From when she was born, count back nine months. Not difficult to calculate roughly is it ? He doesn't want to admit what a love 'em and leave character he was. That's being polite.
I suspect he doesn't want to identify the girl's mother as it will reflect badly on him.
As has been stated by PP's. He didn't use contraception, how many more accidental babies is he going to be accountable for ?
For someone close to 60 years old, he had a curiously young looking, unlined face. A life without responsibilities ?
He looked like he lived in a nice house. Was he trying to look like the good guy by agreeing to take part in the t.v. programme ?