My brother and I are starting to invest on the side ourselves, and from all the podcasts we've been listening to, we want to make sure we are doing things the right way to take advantage of any tax incentives.

My brothers and I are.

@Scott Morris thanks for that insight brother.

Government is controlling commission or transaction cost to make real estate sales more fluid.In Belize commission rate is 10%.My brother is buying a house in Italy.  4.4% interest rate with 30% down.  3 months earlier it was 1.5% interest and 15% down.  

Beside the “subject to” that’s recently become the subject of much debate we utilized  ”no interest short term owner financing”, the “2nd mortgage crank”, substitution of collateral, mortgage subordination, wrap loans, real estate “exchange” (not for tax reasons), sale - lease back, guaranteed rent payments, sale - buy back, land offered in lieu of down payment, zero coupon bonds as substitution of collateral, and a few others that escape my memory.  

My brother had to do this in NJ with overstaying relatives.

Seems people have escaped similar issues https://www.biggerpockets.com/forums/48/topics/1178658-flip-...

My brother and I are wanting to re t out my current home.

If it works well enough doing that, then you can buy it, Airbnb it and rest assured that if Big Brother cracks down, you've got a viable Plan B.Also, I'd definitely contact zoning/planning in your area.

We will need to mortgage the condo or sell it in order to outfit our home (and my brother-in-laws home) for my in-laws to live privately and comfortably.