Hi Amy, I was just working on your line the other day. I have both the Kirkland Source Book of Records (Vol. I and II) as well as Dr. Peacock's excellently researched and sourced book, Kirkland Family Roots, which he published in 2002. It really is the 'bible' for this family. My goal is to keep this line straight/correct here in Wikitree. There is so much junk and wrong information/connections as relate to this family on ancestry that it's just horrible. As long as I'm alive, I'll strive to keep this line right. There are some families that I am pretty sure connect somehow into the line, but I don't have the inclination to try and sort them out (they weren't mentioned in Dr. Peacock's book, and it will take localized research of records to try and trace land, etc.).
Feel free to PM me with any questions you might have. I've researched this family over 20+ years and was in contact with Dr. Peacock during the course of writing his book. I've pretty much taken up the torch since his death to keep the lineage correct.