In his description of the McCaslin-Edmonds' plantation house, Lucius mentions how "the women the successive Edmondses marry" have enlarged and transformed the original building (61). At least some of these wives appear in Go Down, Moses, and Louisa Edmonds, who appears in this novel, is presumably one of them as well.
Lucius Priest tells his grandson (also named Lucius Priest) that when their common ancestor Lucius McCaslin came to Mississippi in 1813, he brought "his slaves and foxhounds" with him "across the mountains from Carolina" (61). Presumably one of these enslaved people is the grandmother of Ned McCaslin, who has her own Character entry; otherwise The Reivers says nothing more about these people. More about some of them, at least, can be found in Faulkner's earlier novel, Go Down, Moses.
