That has never happened in the history of my area so I don't feel to uncomfortable.

You won't save a few bucks by letting your father-in-law "manage" your properties, but you wont have to add him to your LLC or anything else you are uncomfortable with either.I managed my own properties a long time before I became licensed and still do, but they were never 9-10 hours away from me.  

We have plans to turn it into an external set of routines that can be used via Octave, but it's working well enough for us at the moment and we have not had the time to refactor the existing code.

However we can hit our 10 to 15% of gross  Net profits pretty routinely in the foreclosure end its a crap shoot as you say and just a TON of work chasing them all down..

It looks to me as if you're a person that is very uncomfortable to get out of his comfort zone and likes to do things they way they've always been done.

I struggle a lot when networking.I find it uncomfortable and intimidating.

I'll take an answer that is uncomfortable to me all day long as opposed to not getting the difficult facts and having them slap me upside the head at a later date.  

Don't be in a rush to put a tenant in, so if you're uncomfortable with someone just showing them the property, imagine how you would feel if you have to knock on their door to collect past due rent and fees.  

I would calmly explain you have changed the locks and the old tenant does not have a key however if he feels uncomfortable (and people have their quirks) either offer to change for him or have him document a locksmith changed and give you a key.  

If you're uncomfortable about someone, listen to your intuition.