Taxpayer, Taxpayers spouse, and taxpayers parent (dependent who is on disability and AGI is under 5k) sold their main home which happens to be a trailer (car title) in a trailer park where they paid lot rent.

They said it was in all 3 of their names. How would I go about doing this? 

Does the taxpayers parent have to file 1/3 of the sale and not be a dependent on the return? 

Even though it a car title and there is no 1099-S form can they still get the home sale exclusion?