These are several Samuel Pinns, all born in Virginia, that I'm trying to definitively distinguish:
Alas, that tells me about his kiddo (https://www.wikitree.com/wiki/Pinn-59), but what I need to confirm is his parents. Thank you, though! Helpful for yet another spelling of Luvinia / Lavinia / Louannia, and it's nice to finally have her birth surname so thank you for that!
I found an excerpt of a book, Full Circle: Free Persons of Color In Ante-Bellum Virginia, by Anita Baxter-Wills. It might be helpful - the author is a descendant of Robert Andrew Pinn. However, she writes in the excerpt that her knowledge did not extend prior to him. It looks as though it would flesh out the lives of Robert and some of his descendants.