Rhoda had a relationship with my great grandfather George Sherwin, which resulted in the birth of Robert Sherwin Peel. They didn't marry, Rhoda later married Farmer.
George Sherwin had lost his first wife in childbirth (twins) or very soon afterwards. He later married my father's mother Lillian.
No idea where Siddells comes into your family, but thought this might help a little.
Irene Reay (nee Sherwin)