I recently sold 2 to cars to them, and I have to say I was pleasantly surprised. The prices offered was fair, and from them setting foot in my property to the conclusion of the transaction with money in my bank account was less than an hour on each occasion.
You could probably buy the house via a trust or similar, and then "rent" it out to the family via an agent, but both options would add to the costs.
I still would be hesitant, this is more charity/goodwill than a financial transaction if your primary objective is to help the family
IPv4 and IPv6...the equivalent of the dude at the bar saying "this is my last drink before going home". You check half an hour later, he has a new beer in hand and he still says "this is my last drink before going home"...