Are you responsible for taxes based on the gain? Not likely based on your assertion that you have not ownership but only have an obligation to pay the mortgage if the owner does not. Can you demand part of rent received? Not likely based on the above. But, there may be more facts here that need to be discussed. As such, I recommend that you schedule a free case assessment 24/7 by calling 303-688-0944 or online at https://calendly.com/case-assessment/case-assessment. At your appointment, we'll meet by phone or video (Zoom). We'll discuss your concerns, desired results, rights, remedies, the law, the process, timeline, how we can help, costs, etc.