Frankly, if there is no significant damage associated with the cat, then, there is nothing to haggle about or risk losing more money and time in court.I imagine you would have absorbed the repairs caused by wear and tear over the time they inhabited the house.The overall consensus in this thread is that you should just let it slide and move on to more important things.

I would imagine someone would have a high ratio if they are continuously leveraging equity.

They are under a bit of stress as one might imagine so the information I have right now is incomplete but it should still be enough to start exploring their options

You're only limited by your own imagination.

I can't imagine it taking very long to sell.

I can't imagine it's my license, personal home address, etc.

I imagine if you just stick a sign in the yard and don't publicly flaunt the fact that you're renting it out, it may be ok.

I would imagine most sellers are still going to want to see decent credit.  

Large houses are money pits and I couldn't imagine a mansion (from what this sounds like).  

If the family doesn't want to deal with the leftover personal property, I can't imagine why they'd object to it all going into a dumpster.