Taking it a step further, I'm going to claim that George Wynant was the brother of C.H. Wynant, father of "She Who Must Be Obeyed", Hilda Rumpole.
Tele-Genetics are very strong and entire DNA sequences can repeat several times down through any family's lineage. (This was firmly established in the 'Simon And Simon' episode "The Apple Doesn't Fall Far From The Tree".) This is why Nicholas Rumpole, son of Horace and Hilda, looks so much like a younger version of his Great Uncle George.