Other than protecting my mother I doubt I would want to get directly involved. Some situations just basically suck when you get into them.

Regardless of your new father in laws present condition his time is pretty limited. If he suggests he needs help. I would get a lawyer or him to employ one to at least look at the situation and suggest a course of action.

You blundering in to an existing situation on your own is going to be problematic.

For example the land may already be willed to the nephew. Or even worse is no will may exist. There is much to be learned.

At least if no person has occupied some portion of the property for more than eight years is a real upside although I do not know the laws there. Maybe it is just me but I really dislike real estate squabbles to put it mildly. I was hesitant to post on your thread because of this. I have one outstanding real estate issue to deal with myself still.