Abernathy/Rockett is a collateral line I'm currently investigating. According to the Gatewood Genealogy (p 47) Thomas Wicker (middle initial either M or H) was a widower when he married America Ann Rockett, who was b. 1841. Both died in 1891 in Ellis Co, TX.
Her parents were John Rockett (1795-1868) and Anna Johnson (1797-1881); her paternal grandparents were John Rockett (1764-1848) and Sarah Abernathy (1760-?). Sarah Abernathy is cited in several sources as a daughter of Robert Abernathy (1719-1792) of the 4th generation in this country.
Between the Gatewood's work and census records I can identify 6 children of her marriage to Thomas Wicker: Cora, Walter M., Hattie, George H, Robert Lee, and Minnie (Mrs Walter Sullivan). Cora and Hattie do not show up on the 1880 Census in the parental household. Don't know yet if they died young or married.
If anyone has further details of these children and/or descendants, I'd appreciate an email.