I am looking for advice on my soon to be adopted tenants?

[Christopher Curry]

I have an owner finance deal about to close where I was adopting the tenants who have a lease going until August. Those tenants want out and their kid his wife and three kids want to take their place, relocating from Denver. I did background checks and they have over 20k in collections, they pay their vehicles on time, they both have jobs, credit is 620. Is that to much of a red flag or is it more common than I thought for perfectly nice folk to be that deep in collection? Should I hold the parents to their lease and say no to the young family? Help?