Elizabeth Talwin Kenway (b. 1791), Eliza Kenway (b. 1794) and Mary Ann Kenway (b. 1796) are all in the Quaker records for Bridport, DOR.Their parents were a James KENWAY and Ann SIMS who married 10mo 16 (16 Oct) 1788 at Barking, ESS in Quaker records. I have not seen this marriage record yet but the Dictionary of Quaker Biography describes Ann as the dau of John and Ann SIMS of Yarmouth, NFK.
I am puzzled by the reference to Martha.Depending on the context, I wonder if this could be an alternative name for Ann or perhaps she was Ann's sister?
I would be interested in having more details of John's will, or advice how to obtain a copy.