Suggesting to them buying their house for a wholesale range offer or lower dependent on the extent of the rehab, then having a contract in place that gives them a percentage of the profit to help get them back on their feet, paying off debts etc.

If the deal is residential 1-4 units, I'd aim for 30-year fixed-rate debt. 

The name (former tenant) looked familiar and sure enough when we looked at the credit report there was the debt from us from 2023. 1.

It can still qualify if it's a fixer-upper, as long as the rental income from the property can cover the debt service.

A DSCR loan could definitely work, especially if the park’s cash flow can cover the debt.

Weirdly, you may actually be able to get better terms and/or more LTV on the refinance if there is debt on the property as lenders have rules for max cash in hand (max proceeds you get at closing) for cash-out refinances.  

However, you can get loans that are based on the performance of the rental and not your personal income and debt.

It's the concept of buying the debt attached to the mortgage rather than buying the house. 

More than likely a blend of my money and other sources.So, I'm assuming "other sources" is equity, not debt.

If they notice you have another house and your debt to income can't cover it.