Utilize your financial knowledge, give your answer or opinion to the input question or subject . Answer format is not limited.

Boyfriend is coowner of a house with his sister, he wants to sell but she doesn't
Time for a lawyer. Essentially, regardless of the situation "it's not right" for him to be paying the mortgage and only get half the value out of the equity in the house. All other things aside, no court I can think of would allow that. The "could happens" are many, but the most common include; Keep in mind that if he keeps paying the mortgage ling enough most courts will end up giving him ownership outright. Essentially, they will say he has already bought her out by paying her half of the debt.  Unfortunately, any way he goes he is going to need to take action. When there is a missed mortgage payment, a bad tax year, or some other legal issue (some one is injured on the property), the last thing he is going to want is for the courts to decide the issue for him. For example, John breaks an arm while climbing a tree on the property line. John takes the owners of the property to court. "He" says "but my sister owns half" and the courts decide then and there that because he's been paying the mortgage alone he owns the house alone. Seems like a win, except now he owns the liability alone, and owns John $1,000,000 for a silly lawsuit alone.  Point is this. Ownership of property comes with risks and responsibilities. "He" really needs to get those risks and responsibilities under control so he can mitigate them, or he could end up in a very nasty situation in the years to come.