I note this query is a good few years old, however it might be worth me putting up what I have recently found in Aylesbury. There are a good few published books on the Saunders there & the latest, updated in 2015, states that Thomas & Jane Rolls had: Thomas bpt 13 Aug 1691 d 14 June 1749; William bpt 7 Aug 1694 d 28 Nov 1745; Proby d after 1751; Edward d 1759; John d after 1751; Jane; Rachel bpt 1 Nov 1694 d Nov 1746; Elizabeth bp 17 May 1696, married twice. However a document dated 1730 had "Wm Saunders Eldest son & heir apparant of Sir Thomas" & "Edward & Rachel Saunders two of the younger children of sd Sir Thomas". Another document dated 1720 stated that Edward & Rachel were "infants", but they were both alive in 1701, so maybe "infant" just meant under 21. So a bit confusing all round!