JOHNSON: - Thomas Johnson of Maryland and his wife Dorcas Sedgewick had 11 children as follows: Thomas born 1725; Benjamin, born 1727; Mary, born 1729; Rebecca, born 1730; Thomas, born 1732; Dorcas, born 1734; James, born 1736; Elizabeth, born 1739; Joshua, born 1742 ; John, born 1745 ; Baker, born 1747 ; and Roger, born 1748. The latter who died in 1831, married Elizabeth Thomas and had seven sons and four daughters. Baker married Catherine Worthington and had six sons and five daughters. John, who died in 1811 had one daughter, who married Samuel Clapham of Virginia. Joshua, died 1802, had one son and seven daughters, one of whom married President John Quincy Adams, and another married Gen. Andrew Buchanan. Thomas died in 1819, married Ann Jennings, and had two sons and three daughters. Of the daughters of Thomas Johnson and Dorcas Sedgewick, Mary, married Walter Hellen; Rebecca married Thomas McKenzie; Dorcas married Col. Jonas Clapham, and Elizabeth married Captain George Cook.
SOURCE: Vol, IX, No 12, April 1921 Genealogy: a journal of American ancestry