Wrap mortgage two part question

[Fred Stevenson]

I just finished listening to podcast 70. I have two questions.

1) if the the original owner's lien has 20 years left on it, and the new buyer agrees to a 15 year note through me, am I going end up on the losing end from year 15 to 20 in which I'm still paying off the original lien, but I'm no longer receiving a monthly payment check from he person to whom I sold the property

2) what happens to the original owner and what happens to the person to whom I sold the property if I stop paying off the original lien? It seems to me that the original owners credit will be ruined and the bank who holds that loan will want to foreclose in the property that I no longer own. If this is true, then how do I as the middle man assure the original seller and the new buyer that they don't need to be concerned about this risk?