Definitely food for thought.  

More people out of the work force, food stamps, more people renting, etc.

I can probably HELOC my primary residence in the spring, but the last time a tried my DTI was too high, so I'm doing the driving 2007 Yaris and foraging for food in the wilderness thing to pay down debt.

Thanks @Brian GibbonsNobody likes my advice on these though, lol.Being broke with bad credit is a symptom of our priorities.Look around - fancy coffee and restaurant/fast food/bar remnants? 

We've got a deal, because that gross kitchen still counts as a kitchen.At the end of the day when all analysis is done, 5% down Fannie is the best model match financing for Nomadic REI SFR flippers or buy-and-holders. 3.5% down FHA is problematic for various reasons. 

How do I get the calculator to give me a number that works out as a positive for the buy and holder and tells me the most I can pay for the property?

I do know that all the foreclosures that happened when the market crashed weren't from people that owned 100% of their homes...food for thought.

For example, a ROFR may be triggered by an offer received by the owner from a third party; in such a case, the owner is obligated to first offer the property for sale to the holder of the ROFR at the same price and upon the same terms. 

However your state handles it, you should post a pay or quit notice on the very first day you are legally allowed to do so.Your mortgage holder doesn't allow you to pay late.I do feel that it's a different story for someone who has paid on time every single month, then had to get all new tires or was in a car accident or some other unexpected expense and they are asking for an extension well in advance of rent being due, vs someone who is consistently late with no reason or warning.But even in the case of the on-time payer, I'd give them a warning if you decide to waive the fee.

Just food for thought and good luck with your search, hope it works out well for you and the family.