Ok....well that helps me as far as Texas law so you need to contact a property lawyer. My step dad (bless him) passed and him and my mom where on the mortage together. As it was he left no will (?) and his desires were left up to interpretation. After years later my mother joined with another man ( a great guy) and the house needed to be refinanced due to the percentage rate on the note. The title was in both my mother and his name SO where it gets a little tricky. HIs children, without a will, had property rites to 50% of the house and the other half was my mothers. Since he was no longer in this world his children had a say and interest in the home BUT only 50%. In my mothers case unless my mother sold the home or refinanced to clear the title there were no issues but since that was what they had to do they were in a pinch. So after negotionations with my step fathers children, they settled out of court to a monetary amount for them to get thier claim off the title. REMEMBER as long as they did not sale the home there was no claim in this case, only until they tried to sell or refinance was it an issue. What it boiled down to was my step fathers children had a claim on the house as much as if my mother would have died I would have and my siblings 50% and only if the home was sold. The bottom line is there are laws in place to protect people from thier lack of actions and the law will not take the home. As far as the girlfriend I would say if she is a nice lady, charge her a little rent and let her live in the house or it will be locked up in a relstate court for a while. Maybe the old bag will pass away and your left to deal with someone who is easier to deal with. If the G-F was/is a nice lady her man would want her taken care of, if she is crap, then throw her out she has no legal ties. So basically your father in law and his aires are legally tied to that title and the mother inlaw is too. I would very quickly talk to a lawyer to confirm the law and especially before the old HAG gets her own lawyer. I think that your ok depending what your intentions are but she wants the house and ultimatley she may have a claim regardless if it is right or wrong....she seems to be a hag...I hope this helps you...be strong