Hi Tina,
I have a lot of Stanton info for Union County, and do not find an Isaac - doesn't mean he's not related, I just don't have him as a child of David & Nancy (Sullivan) as you speculate. The children I have are: Omar (aka Homer - my line), William Smith, Wallace, Willis S., Sarah M. and Smith. If you want to email me directly, I'll be glad to look further in my files to see if I can find anything.
Penny