Interesting article, and good research making the connection between the names and documents and relating it to our area as so little is know of the personal life of early settlers.
Regarding the use of the word wench. Dictionary indicates it means as a NOUN (archaic) -a girl or young woman.
synonyms: young woman · young lady · miss · lass · lassie · colleen · [more]
So taking it in the context of the times might not sound as bad as we think of it today. Still the sad truth this woman was his slave. The interesting piece is that Robert Brown assumed the responsibility and welfare of his children in his will. We still have much to learn about the relationship of owners and slaves. I’d be interested in what Mrs.. Brown felt about his having 2 children and not by her?