Apart from selfishness, I think a reason he doesn't see the kids is that he now regards Helen as the enemy. His trolling comments revealed a large measure of contempt, showing no respect for her whatsoever. I remember being quite shocked at some of them. I think he's a guy with issues and Helen outshone him, made him feel inadequate. Zippy is jealous and joined in as did her mother. Their joint hatred for Helen helped them justify their crappy, cheating behaviour and now unites them with a common enemy. Walking away from your kids is not normal and he seemed to genuinely love them. A fine old mess. I'm sure Pa Thirkhill is keeping a watchful eye on his daughter's best interests. Myler would be no match if things turn sour.