It sounds like one of your wires is a traveler if they had voltage on a white (neutral wire). 2 way Switches should never break on a neutral. heres how you can kind of trace it out, put your multimeter on continuity.

My Wife is dual-citizen and is selling a property she inherited in Mexico City. 

With this comes a concept called a dual promote and dual-layer fees.  

What if it’s a dual agency scenario where the agent is representing both ?

I spent many years as what is called dual status soldier in the military reserves.

I am currently living in Israel (dual citizenship), so I am required to report taxes to the US and Israel. 

Dual agency is not realistic, but I get your post.

Since my agent also was dual role as my psieudo property manager, she picked up all those leads and got tons of transactions, and the subsequent transactionsBut, if you have no interest in being a salesperson, might not be worth it for you.

Only issue would be size if you're looking dual master suites or something more private. 

I was thinking to have a dual listing with the for sale by owner staying the same but for me to create a for rent listing detailing lease purchase.