The only advise I would have is that buying a house is a long term investment, your circumstances can change rapidly at that age. I was on the verge of buying with a relation and then I met the girl of my dreams and I abandoned that plan to buy with her instead. You'll lose your first time buyers status as well, which is worth quite a bit these days.
Aside from all of that, if you're using your parents, the mortgage protection policy might be heavily loaded because of them.