You seem to have a bad view of this man Mick. He obviously takes care of his woman and child in a new relationship. Is your view coloured by Jennifer? Have you met him? I wish you could talk to him clear. After all he is Jennifer father.
Perhaps she has animosity towards him, but was she was never there when they kids were with their mother, so she might be feeling guilty.
They are his responsibility now the mother has passed away.
Perhaps he was not in love with his ex wife, and tried again with a lady. Jennifer probably hates her?
As for the comment-Disappears for days on end? Most Filipino men I know are never at home, and are usually out working on tricycles or driving jeepney. What does he do?
I think you need to investigate what she plans to do for the future. Whatever decision she makes, affects her husband YOU. I am sure you feel left out of this situation and a bit annoyed too.