For example, I often see Buyers purchase property thinking there is a $1,000 deposit but then the tenant claims it was $2,000 because they paid the last month's rent.

I use Proper, but have not had to file a claim yet. 

Using a Roth IRA for multifamily investments offers tax-free growth, but you lose the ability to claim depreciation deductions

You can try to claim this as an investment property but if the IRS catches wind they are going to see that you are directly related to the "tenant."

But I'm wondering if there is a way my parents or I can claim mileage deductions on taxes for my travel related to taking care of their properties.

Your brother-in-law’s 10% ownership won’t affect your ability to claim this exclusion on your portion.Unfortunately, the option to roll proceeds into another property (like a 1031 exchange) only applies to investment properties, not personal residences.You’re likely eligible for the exclusion, but I recommend confirming with a Tennessee tax professional for any specific state tax issues and to verify your status with overseas residency.Let me know if you need more guidance on this or related financing!

Tax Treaty, which allows you to claim a foreign tax credit on your Canadian return for taxes paid to the U.S.

And, while the broker's work for the seller, most don't want to waste their time either, so if the seller does have unrealistic expectations, having a listing broker (and other offers) can help bring the seller's expectations back to reality.

Only 1 claim on our books.

I e filed claims with both VRBO and AirBNB and had no issues having them paid.