I met a young lady on FB really advocating for them.

The 1st position heloc has nothing to worry about because it will still be attached to the property after the 2nd position heloc forecloses....death of the borrower has no effect on it.Likely not time to make a deal with the “owners” since that would likely involve probate, and time.  

Biggerpockets folks will advocate for real estate as a long-term investment and I'm no different, but while you're thinking about it, I'd also recommend you consider and research treasuries through treasurydirect.gov while rates are still relatively high. 

You've unfortunately unlocked the centipede effect by saying Columbus.

Or because they don't want to be the bad guy.With closing on Dec 4th the issue is that your 28 day notice will be effective Dec 31st and your tenant has until Jan 31st to vacate.

What's the most effective means of dealing with this issue?

Its much more cost effective to outsource things like skiptracing and direct mail.

Read: The millionaire real estate agent; Hyper Local Hyper Fast AgentWhat are some effective ways to network with individuals at all levels?

They will confirm to you that the number has been steadily increasing year after year (Covid or recession effects aside).

It seems like a more cost effective way to have multiple tenants.