My company treats this activity the same (well, almost) as a Child Care (Day care) center, which is a commercial and licensed activity and not appropriate for our leases of single family homes.

Yet, here I am in typical parent fashion, making my first BP post about my child instead of myself.

My wife and I understand that we could give our home to an adult child when we pass away and that our adult child would pay no capital gains taxes on it.But, we have multiple rental properties owned by our LLC and we want to give each our 7 children a property when we pass away.

You need a solution, ask her what that solution is without asking you to stop STR, maybe the petulant child has an acceptable answer in her mind?  

In terms of debts, I agree with @JoeHammel - A title company is the best resource to check on all liens which could be contractor, IRS, bankruptcy, local utility bills or property tax, child support, etc. 

I would think she’s to receive child support payments of a fairly significant amount.  

His wife and child may be moving as well in a few months. 

If you don't really know what you are doing, you could find yourself with a problem child of a property that you did not expect.

That last paragraph is the best advice ... consult a specialist.It is possible to structure ownership of a U.S.A. entity such that it is a child (100%) of a Canadian corporation.  

at first they wanted the deficiancy I went to bat for him and we got that waived.. and of course there was 7 judgements for 7 different moms for child support that had to come out of that 1.7 as well.. :) WE pulled it off and I was pretty proud of my negotiating skills against wells.. but it was running up on a quarter reporting end and I guess they just really needed that loan off the books..