Stating that you have an unpaid debt equal to the amount of settlement funds you need to apply for PR makes your case closed before it starts.
I can't advice you on what you need to do. But you're supposed to declare any loans or debts (in your bank letter) because they can find out and ask you about it.
Fyi, having a brother in Canada doesn't exempt you from proving that you have the exact POF required.
In summary, do what you think is best but ensure you know the risks associated with whatever decisions you take.