Here is a more likely explanation - these probably are "tree orphans" who at one point were connected to someone you entered but then deleted. When you delete someone entirely (who is not a duplicate), you need to start at the outer edges (that is, first delete their parents, grandparents, etc., starting with the earliest, then delete their children or grandchildren, starting with the latest, then delete the spouse and anything about the spouse's family, and only then delete the person you initially had in mind to remove).

In your case, for instance, you may have decided that a particular man did not belong in the tree, but did not follow this process and as a result left in the tree his wife and child (the person about whom you received an inquiry).