Hi: I have info on four of David's six brothers' and sisters.
John McAdoo, b. 1754 Guilford, NC, d. 10-19-1799 Guilford., married 1789 Margaret Houston. Rev. Samuel McAdoo, b. 4-10-1760 (David's Twin), d. 3-30-1844 in Bond, Illinois and buried in Mt. Gilead Cemetary, Bond, IL.Married Henrietta (Wheatley)Wheatly, 7-24-1806.He also married Catherine Clark, Hannah (Coke/Coop)Cope. John (McAdow)Devil John McAdoo, b. abt. 1762 (this is my ancestor) d. Bef. 1820, Jackson Co., TN. Married Mary Dennin, 9-27-1783.Also married Judith Stewart (my ancestor) and Lily (Lillie) Cook. William McAdoo, b. 1764. Nellie (Eleanor??) McAdoo, b. 1766.
If there is anything more I can help you with, let me know. Have a great day.