Hi I am a direct descendant of the Metcalf/Betsey Melvin you asked about on Roots. The Metcalf had no e on the end until 1893.
George Metcalf ships mariner married Elizabeth Melvin(Known as Betsey) on 01/08/1831 in Holy Trinity Church, Sunderland, witnessed by Thomas Noble who was Georges stepfather, and David Melvin, Betseys father.
Georges parents were Dorothy Wilkin born 1783 Bishopwearmouth, Sunderland, and George Metcalf they were marrried on 03/01/1809. Dorothy died at 21 Church Street Sunderland of bronchitis, on 13/05/1850.
If you have any information to share please let me know. I am interested in going back to Dorothy and George Metcalf, as I have Dorothys date of birth and death, however I am struggling to find information about the George she married in 1809.