When I saw what was present on FamilySearch, I got the impression that this Sarah (Unknown) Norris could easily be the parent of all the children listed, but with paternity known only on one child.
After writing up the profile and examining the relationships, even while attempting to leverage the relationships described on the Slaves of Robert E Lee, I think the lack of citations on child profiles except Selena (Norris) Gray and Sarah (Norris) Hoffman (the latter being the only one with her father named), the maternal origins become less certain for all of the children except Sarah (Norris) Hoffman.
I have to dig through the documentation on enslaved persons of Washington, as she and her husband may have been named there...
Does it seem like any of the children should be moved to Research Notes? Should Selena be left attached or just noted out?