William born 9 September 1838 was the son of William Quayle born 18 Jan 1811, older brother of John Quayle, born 17 Jan 1815. The parents of William 1811 and John 1815 were John Quayle born 28 March 1783, married 14 March 1809, died 12 March 1856 and Jane Corlett, born 1778 and died 11 Aug 1841. John Quayle 1783's parents were William Quayle, born 1746, married 30 Januray 1773, died 1804 and Isabel Christian, born 1759, died March 1831.
I hope this helps, I can let you have more if you would like it.
Janet.