they need evidence they own the house (copy of the deeds is good), also they need to write a letter of support for you stating that you and your wife can stay for as long as they want, also evidence that it will not be overcrowded with your wife living there, how many bed rooms has the house ? will just you, your parents and wife be living there?, if so, should be ok if its at least 2 bedroom house, if you can send some photos of inside - thou i never did,
