Personal Bankruptcy Bankruptcy question - please help

[PJofSMK]

Ok, my in-laws and my Wife own our Duplex together. All their names are on the Deed for the house. The strange thing is, only my Father in-laws name is on the Mortgage. The problem is, my Mother in-law is threatening to claim Bankruptcy on us so we lose the house. She is a very sick woman with Bipolar disease and refuses to get help. So my question is, can we lose the house if they claim Bankruptcy. It would make no sense to me seeing only his name is under the Mortgage and not ours. If they did claim the Bankruptcy wouldn't they lose their half of the house.