James M. McKay, born: ca. 1801; died: 2mo 1842;

James, & Harriet,
(Harriet, had 3 other children: Eliza, born: ca. 1848; - two infant girls. Their father is unknown but could possibly be John William Keiser.)

According to "The Origins of William McKay & Family" by Gerard McKay, Harriet was a slave of James M. McKay and through documents and DNA testing James fathered possibly two children with her.

Issue:

• William {McKay}, born: 5mo 1839; St. Charles Co. MO; died: 1882; His surname is listed like this because he was born a slave and took on the McKay name when he became free. He used the name "McKee" in some records. DNA testing confirms this connection.
• Margreth or Margaretha {McKay}, born: ca. 1842; died: 4mo 1852; Her surname is listed like this because she was born a slave. No DNA evidence is available but it's likely James was her father as well.

James, married: 19 10mo 1841; Rosiena "Rose" Pfaar, born: 28 2mo 1821; Bavaria; died: 28 1mo 1892; buried: Emmanuel United Church of Christ Cem., Weldon Spring, St. Charles Co. MO; dau. of John Pfaar & Mary Long; See her Find A Grave entry.
(Rose, married 2nd: 2mo 1843; John William Keiser, born: 5 3mo 1820; Germany; died: 11 12mo 1878; Weldon Spring, St. Charles Co. MO; buried: Emmanuel United Church of Christ Cem., Weldon Spring, St. Charles Co. MO; See his Find A Grave entry. They had at least 8 children. Information can be found on Find A Grave. This will be expanded later. )

Issue: McKay

• Mary Ann, born: 18 7mo 1842; St. Charles Co. MO; died: 29 1mo 1917; Weldon Spring, St. Charles Co. MO; buried: Hillenkamp Family Cem., Weldon Spring, St. Charles Co. MO;

Source info: The Origins of William McKay & Family; Find A Grave;