If all parties with a beneficial interest in the property and providing money towards the purchase are not FTBs then they are not, in fact, jointly FTBs and any attempt to get around this (e.g. by just putting the FTB's name on the property/mortgage deeds in an attempt to reduce the stamp duty payable) is most likely tax evasion. Judging by some posts here on AAM some professionals (e.g. brokers, solicitors etc.) who should know better do collude in this but it doesn't make it any more legitimate for all that.