I think I can help you with the Susan Murdough/Susanna Long part of your question.Susan Murdough married Daniel Long;when Daniel died, she remarried Joseph Adair, Sr., a widower whose first wife was Sarah Lafferty.Susanna and Joseph had no children together.Susanna's daughter, child of Daniel Long, Mary Long Owens, is my ancestor.
Here are my genealogy notes for this family:
DESCENDANTS OF DANIEL LONG AND SUSANNA MURDOUGH
The family of Daniel Long were Covenanters in Scotland during the reign of Charles I and fled to Ireland to escape persecution during the reign of Charles II.
Daniel Long of County Antrim, Ireland married Susanna Murdough in County Antrim, Ireland.
Children born in County Antrim:
Samuel Long, b. abt. 1757, died Nov. 15,1776, age 19, buried in Duncan’s Creek Presbyterian Cemetery, Laurens County, South Carolina
Mary Long, b. est. 1760, married John Owens of Laurens District, S.C.Died probably 1823 [A broken tombstone in Duncan’s Creek Cemetery next to her son, Thomas Owens, states Ma?? Owens, d. 1823, and that is surely her]
Robert Long, b. 1763 or 1764, died January 20, 1840, m. Elizabeth Ralston.
Daniel Long, Susanna and their three children emigrated to Pennsylvania in about 1764-65 when son Robert was 4 or 5 months old.
Daniel Long moved his family to Laurens, SC in about 1766-67, when Robert was two years old.
Daniel Long died in about 1767-68, when Robert was four years old.
[Source for Daniel’s year of death was Rev. War. pension app of Robert Long, who gave his age as four years old when his father died.]
After Daniel Long died, Susanna Murdough Long remarried the widower, Joseph Adair, Senior, who had also come to the Laurens District from Pennsylvania in about 1752.Joseph was also originally from County Antrim, Ireland, and had been a good friend of Daniel Long.Joseph was of the prominent Adair family whose name is well known even to the present day in County Antrim.Joseph Adair, Sr. died in 1788.
Living near Susanna Long in Laurens District was Thomas Murdough (and a female, presumably his wife), about Susanna’s same age.Perhaps Thomas Murdough is Susannah’s brother.A Thomas Murdough born 1728, died August 15, 1809 is buried in the Duncan’s Creek Cemetery.
Joseph Adair, Sr. was a cooper by trade.In his will dated January 9, 1788 he mentions his wife, Susannah, sons Joseph (Jr.), James, and Benjamin;his daughters Jean Rammage and Sarah Adair, Mary [Long] Owens [Susannah’s daughter] and her husband, John;and his son-in-law [step-son] Robert Long.