Because it appears you have not been in a defacto relationship for two or more years the Commonwealth family law act would not apply, but the Queensland Property Law Act Part 19 would apply and can be found here:
Essentially it will allow you to apply to the court for orders, if you cannot reach a mutually satisfactory agreement, for an adjustment of your property interests so that you can separate on a fair basis. Normally such an application would not be necessary however because it appears you have mingled your assets, including those of your father, an application of this sort may be necessary.
If your partner has debts, do not delay as if he were to go bankrupt the assets presently in his name may be claimed by his creditors, which would then frustrate any claim you may have to recover the capital you and your father have invested in the property.
Naturally I would recommend you engage a lawyer to pursue such a claim for you.
I trust the above assists.
Good luck and please rate my answer.