<prompt> Human: Hi all,Basically Im in the last stages of buying a house. Offer has been accepted etc etc. Me and my sister have bought together with my dads help, but my girlfriend will also be moving in in the next 6 months. Now my dad wants her to sign an agreement along the lines of I am only paying rent and am not contributing to the mortgage so I will own nothing when it comes to selling along those lines this is completely fair in my eyes and my girlfriend is happy to sign. Is there an official name for this kind of thing, Im a bit stumped hence the weak thread title.ThanksUK preferable  <response>: Its called a Residential Lease. 