I did a general search in the Grimes County message board for "Sullivan" and this was the first thread to come up. Guinn Sullivan would have been my 2nd cousin, 2x removed. James Noel Sullivan (the first) and Martha Edwards were my gr-gr-gr-grandparents. Their son, Edward Franklin Sullivan, was my gr-gr-grandfather and his daughter, Sophie Sullivan, was my gr-grandmother. My grandmother is Gloria Ann May (still living) and my mother is Bette Barclay Rosse (also still living).
I see that McAlpine is a surname listed with your thread. I know that Martha Edwards mother was a McAlpine and I also recently discovered that surname listed in the First Texans book published by the Texas Genealogy Society? Sophie's sister, Blanche Sullivan (Hubert?) applied for DAR under Malcom McAlpine but, I didn't know that he had come to Texas???? I would love more information on this, if you have it? I was going to order the books too.