Going back to John Allnatt 1814
His mention of sisters Sarah and Mary
They are daughters of Edward Allnutt willof 1758 Maltster.
Sarah married Charles Pickman 6 November 1757 by license.
Mary married John Tuckwell 12 November 1768 by license.
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So John the nephew of William 1784 is the son of Edward and Sarah nee Pearcy.
William is not the son of Edward.
Edward 1758 has a brother John who could be William's father, needs more research.