I don't have any solid proof to substantiate this, but, I was led to believe the following and am offering it as a way to lead you to what you might be looking for. "Berry" or Raspberry Byrd b 1819, was married to Caroline George b 1819.I don't have any issue for them.In 1848 Caroline married Berry's brother Lemuel b 1804.Caroline George Byrd was Lemuel's 2nd wife.I have him first married to an Isabelle Matthews abt 1837. I believe that Francis Marion was the son of Lemuel and Isabelle, Carolyn was his stepmother. Siblings with mother Isabelle were: Lemuel 1838, William 1841, Sarah 1843, Harriet 1844, Julia Ann 1846. Half siblings with mother carolyn: Raspberry 1849, Isabella a851, Walter Douglas 1860. There are some census records that will substantiate some of this. I hope this will help you find the precise information and that my explanation is clear.