However, I am the primary owner.Current Situation: My aunt’s daughter (my cousin) lives in the house rent-free.

It's as Buffest warned, the greatest transfer of wealth in human history in action. 

Their familiarity with the local market and diverse financial products could be beneficial.Huntington Bank: With a significant presence in Ohio, Huntington Bank provides various commercial banking solutions and has a history of working with business clients, including those with complex ownership structures.PNC Bank: As a major regional bank, PNC offers comprehensive commercial banking services and has experience dealing with corporate clients, which may align with your fund's requirements.It's advisable to contact these banks directly to discuss your specific needs and assess their ability to accommodate your investment structure without personal guarantees.

She’d recently moved out, leaving her unemployed husband in the house, and was living with her daughter.

The other unit he rented to his daughter and family, they lasted 2 months and caused $5000, in damages to the brand new unit""3 years later over $150,000 of renos, he seems to keep coming to us with repairs after repairs"Sorry, but after her requested moving outlets for appliances, I would have said this isn't going to work. 

I just got confirmation he got a job but obviously the only thing I can verify is his rental tenant history. 

Quote from @John Mason: Yes when you go to Zillow to the house and look for Market value tab you will see some thing like thisZestimate® history+192% in last 10 yearsThe CEO of Zillow sold his own home at 40% BELOW the Zestimate, so I would caution that Zestimate ≠ Market Value.

Quote from @Jon Martin: Quote from @JD Martin:  I've got a long enough history with LTRs to know that generally you don't want tenants doing more or less anything because it's amazing how little common sense a lot of people have, and this translates into not asking guests to do chores because 1) they've paid a cleaning fee, 2) it's a vacation even if it's a home, and 3) guests that do chores might just put dirty towels back on shelves and dirty dishes back in cabinets. 

Request for maintenance records and tenant payment history.

Pretty much whatever makes sense.My plan is for it to be a midterm rental most the year and then be there for a portion of summer to be close to my daughter.