We believe that Mary Twatt 'married' Charles Thwaites in Shetland, or at least he was the father of James Charles Thwaites hence the change in spelling. Her sister however used the spelling Twaiets on her marriage certificate of which we have a copy as she was my great grandmother. We would be pleased to make further contact and would welcome any details on the early career of James Charles Thwaites. The Lloyds Captains List with the initial T are yet to be catalogued in London. We have researched the Calders at Guildhall, Kew and Greenwich where the National Maritime Musuem(NMM) holds their original masters certificates and application forms.