The Turner family are the descendants of Great Grandfather Turner, the family tree might look like this: ^{might have been}

Great Grandfather Turner
          =
Great Grandmother Turner
          |
Grandfather Turner...Maria Turner... other siblings?
          =
Grandmother Turner
          |
Molly Turner...Jim Turner (both adopted by Maria Turner)
          =
Bob Blackett
          |
Ruth Blackett (Nancy)...Margaret Blackett (Peggy)