Welcome to the Shinn family. There are a lot of researchers out there. i happen to also have access to the Sebrell family book written a few years back. We are a different line of the Sebrell's, but have the same lineage as your Joseph' grandparents. In fact if I have been told correctly, your Joseph Shinn's father was Tthomas Shinn and Sarah Sebrell. The same Thomas Shinn was also the father of my Mary Shinn by his first wife.