Hope you are still around after all of this time.
I have the same Isaac Green with Phoebe as a wife but can't I.D. his father. I believe Isaac is the father of my James Green who was a Methodist minister who started his family in the Cherokee Nation East of Tennessee and then moved on to Alabama in by 1850 and finally on to Texas. If this is indeed the right Isaac he is my 4th great grandfather. If you have any documentation on Isaac it would be great if you would share. I would be happy to share any info I have.