Hi Pam, Can't offer proof of the meaning of Dd and you may already have this but have you seen George and brother? William on the 1841 census for St. Pancras, Chichester, Sussex? He seems to fit in with the age of your George. A William Edward Robins b. Chichester is with the Royal Marines, Alverstoke, Hanmpshire, rank Private, in the 1851 census, a carpenter, may be yours, Lynne.