For instance, when we're complete with the rehab for the original 13 units, could we refinance (which would allow us to recoup some / most of our capital) in order to reduce the cash strain required to complete the rest of the rehab?

Now that doesn't solve all of your problems, but maybe eases the financial strain a bit if you're dealing with a more affordable house to begin with. 

The 90+ hour work weeks coupled with the rotating work schedule of days/nights has led me to reevaluate my priorities.

I currently work overseas on a 2 month out 1 month stateside rotation.

My days became a constant cycle of worry,  IEP meetings, doctor and therapy appointments for my son, loneliness and financial strain due to our income suddenly cut in half. 

Yes, but I keep the locksets and rotate them with other properties

So I have them in a ladder like rotation, the first 5 yrs I only have two balloon payments, but I have forecasted that I can afford 3 at year 7 and etc... as you pay off, your surplus grows and you get a snowball effect.

@ Cody Weiss I am not quite sure to be honest,  that is why I wanted to ask the question and see what the more experienced think :) In my mind, if we're out of nafta, this will put a strain on the auto industry in the region more than anything else, resulting in job cuts -> less ppl that can afford to rent in the city.

In this case  there's this dynamic of a strained family relationship where these individuals don't and will not speak to each other.

Time is money and if one partner is always on the phone getting bids, rent collecting, etc and the other is completely passive it will put a strain on the partnership.