Wife's father demanding money from her
Q: My wife was abandoned by her father when she was 15. and then sought by her father again when she was in her 20's. just because of the reason he was sick. Since then he has been regularly taking money from her. Recently he sold the family house and did not give her anything, and moved to another city and bought a house, knowing well that she cannot come to that city often , because it is far and also because of her job. but her father is regualarly pressurizing to come to that city and also regularly taking money from her. I would like to emphasize that he gives the money away which he takes from her and also the money from the sold house he had left over he is constantly giving that away too. This has been going on before i got married to her. she has three children from her previous marriage. Her father has never treated her as a daughter, but only as a source of money.
Now my wifes daughter is sick and her father is telling her to come to his city. In this scenario who should she prefer, her sick daughter (who is 12 years old) or the father. Her father is again blackmailing her that he is sick or something. I would also like to point out that his father also has his wife with him (who is my wifes step mother) and also relatives in that city. But he insist her to come every month and along with giving him money he demands gifts from her.
Also whenever he calls her or when she goes there, he demands from her to get a divorce from me, because i am abroad. This a brief scenario, Am i within my rights in the light of Islam to forbid her to go to him?