Need help in a rent stabilized building situation that I have?

my cousin his wife and 2 kids live in a 2br. apartment in Queens NY. the apartment is under his fathers name. recently the management found out about it and said that they would need to put the apartment under my cousin name. right now he is paying $1100 and they want to raise the rent on him. what are his legal rights in the apartment? any help would be greatly appriciated