Hi Kerry,
I am one of your SC cousins. Isaac, Jerimiah's father, was my 6g-grandfather. Have you been to any of the reunions at Juxa plantation in Santuc, SC? If not, I have a photo of the plantation and some of the graves in the family cemetery on the property I could send you.
Do you know who Isaac's father was? I have hit a wall- one recent possibility I have found is Jachin Gregory, b. 10 May 1682 in Norwalk, CT.
Roger