Father abandoning his children

My friend's mother died last year and they had 8 kids. It was less than a year and the dad fought with his children on purpose and ruined his kids birthday so that he can go Pakistan. It was a planned visit and went Pakistan and got married against his kids wishes. All he does is listens to his wife and has pushed all his kids away from him. He don't listen to the kids and all he does all day is talks to his wife. All he does is listens to that lady and then wants his kids to listen to him. Don't know what she should do? The lady is greedy and wants him to give his lands to her and not to his family. Also all she ever does is asks for money. Her family is greedy but he wont listen. The kids are so lonely and on the verge of doing something wrong?