Too many pets for a small house!!

I temporarily live with my father. I pay him rent every month for a room, until my fiance' and I can get back on our feet.
   

   
I share my room with my cat, and my three rats.
   

   
My issue is this: My father has more animals than he has room for. He can't afford to take them to the vet, or even purchase food. My grandmother buys dog food every month to feed the dogs, because my father said she could keep her puppy there. He also gets cat food "donated" to him whenever he runs out because he cannot afford to feed to all of them.
   

   
When I first moved in, I began helping because it wasn't that big of a deal. But with all of the animals he has (and continues to acquire), it became difficult for even me to help take care of them. I continue to take care of my animals, with vet visits, food, whatever they need, but I'm worried about the other animals.
   

   
I thought about calling the humane society, but I was told that even if my pets are in good health and are properly being taken care of, that they will still take mine because they're in the house. I really don't want to lose them but at the same time I hate to see these other animals living in filth.
   

   
I've tried to talk to my father and his wife about it, and the furthest I've gotten was his wife calling my mother in law, and asking her if she would like mice or rats. When she's turned down she just decides to keep them.
   

   
& If one her "beloved" pets pass away, she runs out and purchases another of the same species. I really have no idea what to do. Does anybody have any suggestions?

All I could recommend is going in to the humane sociatly in your area and explaining the situation to them. Otherwise try to find somewhere for your pets to stay for a short while and get them in then.
   
You obviously care deeply about all the animals welfare and I think if something happens you will just blame yourself, I know I would.
   
Hopefully you will be able to sort this out by talking to someone at the local centres.
   
Good luck and keep in touch on how it goes.

Sounds like (no offense) your father and his wife have issues. People horde animals for many reasons and they tell themselves the animals are better off living with them then on the streets. However the situation becomes to big (too many animals) to handle because they want to take in every stray they see. Soon they cannot afford to care for the animals and even though they think they are doing good they are not. If you call the haven humane and explain the situation to them and let them know you have your own animals there that are well taken care of they will understand. Most likely they will come and seize your father and his wife's animals letting them only keep a few. (however many cats and dogs they are allowed to have by city ordinance including you cat) They will take the sickest animals first then the less healthy ones, and so on and so forth. But I do not see why they will take your animals too if they are well taken care of. Your father and his wife would also have to get counseling ordered by the haven humane and city if they are true animal hoarders to help them with their behavior.