So - if Charles & Ann are the correct parents for William Hampson, father of John Hampson, we have (from IGI)
Charles Hampson (age 21 batchelor) m Ann Massey 9 Jan 1755 Bowdon
and then baptisms in Bowdon with parents Charles & Ann
Charles Hampson 14 Sep 1760
James Hampson 23 May 1762
Alice Hampson 23 May 1762
John Hampson 13 May 1764
William Hampson 16 Sep 1770
George Hampson 30 May 1773
Charles Hampson Burial 26 Sep 1776 Bowdon
That doesn't quite match what I was expecting, as we know William has a brother Richard. Of course, there are plenty of gaps in the above list where other children could've been born.