Unfortunately baptisms in market Drayton only give the father's name, so I cannot be certain of the mother.
Ann had a son John a few months before she married William. There were three children sons or daughters of William baptised George 1766, Mary 1768 and William 1770.
Then there are more children's baptisms in 1779, 1785, 1786, 1790 (sons or daughters of William) and two on the same date in 1794. The last pair are son and daughter of William and Mary, so at least I know the mother of them. The register doesn't say they are twins, one might be a couple of years old.
None of the records give date of birth. I think they may be BT's on FindMyPast, although they do have the actual marriage register scans as well.
The gap in births does fit with Ann dying and William remarrying.
Ann's brother left considerable sons of money to nephews and nieces, with help of some kind people on the deciphering board they have confirmed they were Hopes, and look like the illegitimate John, George and Mary. Nothing to William jnr but he might have died by 1811 when the bequests were made. None of the later set of children were mentioned (I know the first two died in infancy) this could be because they were not blood relatives of Ann's brother or because they had all predeceased the brother. I am still trying to find what happened to them.