Roswell King, Jr. (1796–1854), the second son and namesake, took over as manager of the Butler plantations in 1820 and worked there until 1838, after which he moved to Alabama to develop his own plantation. Kemble wrote in her journal that he was said to have fathered several mixed-race children during his tenure. She identified them as including Renty, the twins Ben and Daphne, and Jem Valiant, whose mothers were the slave women Betty, Minda, and Judy, respectively. The slave Scylla also had a child by King, Jr.