I have carried out quite a bit of research on the Kynaston Line. The father of Edward B 1788 was not William but another Edward, Born 1760 at Brownheath, Loppington, Shropshire - Married to Martha Embery on 28/11/1785 at Whittington, not Martha Hallmark. The record of William is an error. It is recorded in the in the indexed & printed register of St..Oswald's Oswestry as William, however a footnote has been added by the Rev T Salwey stating the name William was wrong, it should have been Edward and he knew that the eldest son of 1760 Edward was also an Edward Born 1788. He refers to the next baptism in 1790 which was Arthur son of Edward Kynaston (wheelwright) & Martha (29/10/1790). If you check the IGI you will see a record for Edward 1788 showing the father as William or Edward & the mother as Martha. I have viewed the actual record at Shropshire Archives.