Our plan is to rent each of the 3 bedrooms of the main house as mid terms and the in-law as a long term (already have a tenant in there).

Try looking into zillow/Redfin and see what your potential rents you can get near the neighborhood by filtering the bedrooms/bathrooms of the intentional property that you are planning to buy.

My primary residence, single family home and a large 7 bedroom duplex 

Family services will inspect the home and limit occupancy based on the number of bedrooms.

Bathrooms or bedroom add ons).

My wife and I currently own two identical condos (3 bedroom/2 bath) in the same community.

Are these normally 2-3 bedrooms?

In this case, he gave us ample notice to (most likely) fill that slot, however, I'd like to protect us in the future.

With your income, you'll have ample options, especially as a first-time buyer.

I tend to have an easier/faster time renting my 2 bedroom units than the larger ones.