all i gotta say is Run

Okay, before I start giving advice on this topic: ignore every comment that says 'grow a pair', 'put your foot down', 'say no' or 'divorce her'. All of those are unhelpful and trying to direct you to be someone who can't compromise or solve problems and are basically saying that you should control your wife as if she is an out of control animal which is wrong, it should be an EQUAL partnership, not slavery where you can override any decision she makes. Now, to solve this problem, you need to talk to your wife. Bring it up vaguely at first by saying 'Dear, I wish to discuss something with you.' When she asks what it is, then tell her you wish to speak about her mother. Then tell her that you do not want to buy your mother-in-law a house and live with her because if you are buying a house, it should be for you and her, not your mother-in-law. Explain gently that you understand that she wishes to help her mother in any way possible and that she may move in with you both until she gets back on her feet but that it would be unwise to buy a house in this economy and it would be especially unwise to buy a house for someone else just because they have fallen on hard times. Listen to any points she makes and discuss the topic until you both come to a compromise and don't let it rise into an argument. You have to remain calm and not let annoyance or anger get the best of you as that will not solve the issue. Hopefully you will come to a compromise you both like, or at least a decision that you like better such as renting your mother-in-law an apartment instead of buying her an entire house.

Just say no.

Im sorry

Get a new wife and mother in law

Oki seriously, there should be a "Mothers-in-law" section on FML.. Poor you :/

Sounds like you need to get the divorce papers in order

remeber she raised you and put up with your shit too. parents are the best people you will ever have

Divorce her now!

DIVORCE before it's too late!