Firstly, if your wife is still training to ACA then to expect to afford a house is something, I certainly couldn't years ago and I accepted it as I was still training, had to start somewhere.
Secondly, if you bet on house prices, this is a potential outcome. Accept it. You gambled, and lost. Don't gamble again.
Thirdly, you parents offered you a big some of money, many, including mine never were in a position. You lucky sod.
Does that put things in perspective.