If he is willing to carry the house completely no payments until we sell etc. what is the best way to protect everyones investments to make sure everyone is set?

Any time you have a renter, you should provide them with a Lead Paint Disclosure Form and the pamphlet on how to protect themselves from lead paint.You can get the form and pamphlet here: https://www.epa.gov/lead/real-...

What other things I can do to protect myself in this situation?

Without clear answers, I think that liabilities are being created to protect from other liabilities.  

It's worth reading to get an idea of what's involved and how to protect yourself.

What is your practice during winter with regard to protecting your water pipe?

Or does this warranty deed protect me ?

I understand the credit and tax implications might not be your expertise, but any advice/insight is greatly appreciated.Thanks in advance, Kevin.

All your expertise is much appreciated in advance, Cornelius

I have been consulting a lawyer about the best way to set this up so everyone is protected.