Thank you!

1.  I found details to my question:  Inherited IRAs (no tax basis, all pre-tax contributions) are separate and do not affect pro-rata calculations when considering taxable consequences for Backdoor ROTH IRAs.

2.  If there is a RMD from an inherited IRA, Form 1099-R box must be checked where it says that it was inherited from a non-spouse, this distribution amount will then not link onto Form 8606 to decrease the Non-deductible IRA contribution. 

This is in Proseries Basic.