Closing On a Property with Cash from a Relative...

Sorry if this isn't the right place but I have a relative who has seen my modest success in partnering with other family members using traditional mortgages on two 4-plex's and is interested in partnering with me/us by investing in other small properties IN CASH. My question is how do I legally and most advantageously close on a property with someone elses money instead of a bank? I.E. will my relative simply be the one to provide proof of funds to the seller and then wire the money directly to the title co at closing? Or is there something else we'll have to do to keep everything kosher.

Thanks!