How were they able to sell the property if they did not own it. The selling party or parties has to have a Deed of Trust in their name or names. If they did not record the quit claim at the time it happened, it obviously was a factor when it came time to sell the property. It was probably submitted to the title company before the sale closed to satisfy that requirement, For Title insurance and a clean title to close escrow and the buyers to get a mortgage (if needed).I am sorry your friend is out of luck and there is no need to get a lawyer in that situation. But...if it was a private transaction as i think your describing, if it was quit claimed again to the new owners,and they are now in possession (i hope) of the property. Have your friend run a title search of the property, or go to the county recorders to find out who actually owns the property. If the quit claims were not recorded, i would tell your friend, if in fact he turns out to be the real owner according to county records, to sell the property out from under the current,so called owners. It was their mistake and let them fight each other over it.