I also am a descendant of the Lard/Laird family of Barnwell County, SC.My ancestor Absalom Lard, like your Timothy Lard, is on the 1850 Census of Scott County, Mississippi, (p. 282, dwelling 377, family 377, lines 38-42). Also, like your Timothy, my Absalom was born in Kentucky in about 1804.When I first discovered these census entries I thought perhaps Timothy and Absalom were twins. However, Timothy is mentioned in the will of his father, Josiah Lard, in Lawrence County, Mississippi. Absalom is not mentioned. I think they were likely first cousins. You may be correct about your theory of the births in Kentucky taking place as the family migrated via the Tennessee River.However, it seems likely to me that the families went to Kentucky and then back to South Carolina before making the trek to Mississippi. They were issued passports to travel through Indian lands in Georgia on their way to Mississippi Territory in 1809. I believe that Absalom might have been a son of Thomas Lard who died in Amite County, Mississippi, in the 1830s. However, Absalom is not mentioned in Thomas' will.