Robert,
Given that your father is the owner I think that as long as he gives written permission for you to live there it won't be an issue for the ECO. You could just include a couple of photos as back-up.
Don't get too hung-up on that, the visa will not be refused because you don't have your own property.
When we first arrived in UK we also stayed with my parents. No problems with UKBA at all. It's much more common than you might imagine.
I bet if and when you decide to set up on your own he'll really miss you both. I bet your wife will miss him too.
Don't wo
