If I'm correct, I think these are the relationships - Deltics and Linda Wellings are cousin and they are second cousins to Dido and Welshbrummie's mother/father, who are also second cousins. Welshbrummie, you would be the third cousin of any children they may have.
1. William & Emma Talbot- 2. Millicent - 3. Albert Smallwood - 4. Deltics
1. William & Emma Talbot - 2. Millicent - 3. Lilian Smallwood - 4. Linda (Wellings)
1. William & Emma Talbot - 2. William Henry - 3. Winifred - 4. Dido (Walker)
1. William & Emma Talbot - 2. Walter James - 3. grandmother - 4. mother/father - 5. Welshbrummie