Ask a Canada Law Question, Get an Answer ASAP!
Why does he think he does not have to repay you?
You can get an order for the sale of the house and at the same time seek an order giving you more of the proceeds than 50% based on what he owes you.
He has to repay the loan as it was not a gift.
If you paid more by way of down payment then you can argue that you would get a larger percentage of the profit. You should each share in it in proportion to your respective contributions.
So for example, if you paid twice as much as he did then you should get 2/3s of the profit and he should get 1/3.