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Yes, Mourning Horn is one of the 8 children of Abishai Horn and Mary Ann Ricks. Mary Ann, called Ann Horn in her father's will, which also mentions son-in-law, Abishai Horn, is the daughter of James Ricks and his 1st wife, Judith Ross. Mary Ann was born in 1752, and must have died before 1795, as she is not mentioned in Abishai's will of that year.
Off the subject; I am assuming, from some of your postings, that you descend from William Tooke, younger brother of my ancestor, Thomas Tooke. The brothers are the sons of James Tooke, the immigrant 0f the 1620's. Through our ancestor, Joyce Hoo, we descend from some of the medieval Nobles and Royals.