Can't share much information on this, but: The biography of William Drennan, Sr. [as he was then called] found in "The History of the Early Settlers of Sangamon County, Illinois" [Power, 1876] stated that this William was born in Pendleton Dist., SC, in 1768.He migrated from there to Caldwell Co., KY, then to Sangamon Co., IL, in 1818, and died there in 1847.There is also a bio of his younger half-brother, Joseph, in this book.Both can be found posted at the Sangamon Co., IL, genweb site. In her 1920s book "The Doddses", Lydia Colby stated that William was a son of William Drennan and Sarah Barnes, and gave some dates for these people.Unfortunately, she didn't say what the source of the information was, and I've never found it.If there was a bible for William [Jr., he would be, in this case] that gave this information for his parents, no one's ever brought that information forward. That William of Sangamon Co., IL, was son of a William, I do believe, inasmuch as he married Mary Thomas in Pendleton in 1792, per her own statement made after his death.In other words, I think it's valid to assume that he was living in the household of William Drennan in Pendleton in 1790, the only Drennan household there in that year.That household included 5 males of 16 and up, 3 males under 16, and 5 females, which could easily accomodate all of the Drennans in the 1800 census- they were probably all his sons, and the female either a widow of one of his sons or his widow, depending on her age.As I said, the 1876 biography said that Joseph had a different mother than William- and William's mother is said to have been Sarah. Colby said that the oldest William and wife were from Cumberland Co., PA, which is a lead you might want to follow up.I have also seen some postings, I think both on this forum and at the Caldwell Co., KY, genweb site which list members of this family.You might want to contact the posters. If you find anything factual, I'm sure all of us would appreciate your posting it, with the sources.