Hi
Not sure what you're after or want confirming.
I can see the marriage for William and Sarah as you said and a son William baptised 26.6.1723 again of Duntish.Dionysius 26.4.1725 of Duntish.Daughters Sara 21.3.1728,Unitas 14.5.1731 and Anna 6.1.1732.
There is also a marriage for Samuel Mullet of Duntish and Elizabeth Major of Henley at BN 27.5.1725 and
Robert and Dorothy Miller 1.4.1725 of Duntish
So it seems the Mullet family a re definitely from Duntish.
But there are plenty of other Mullet marriages in the parish a bit latter on.One of the witnesses to Robert foot and Ann Mullet's marriage is a Mary Mullett if that helps.
If we go with William and Sarah as her parents then there is a baptism on the date you found 3.6.1703 with also a daughter Elizabeth child of Edward Mullett of Brockhampton.
There's a Edward Mullet junior 8.5.1712 baptised but no parents, and again 17.1.1716
Possibly Samuel 20.7.1707 s of Edward? of Duntish.
And there is a marriage for Edward to Ann Vincent 15.10.1695.
There's a possible burial for Anne 26.1.1748
Edward and Richard Mullett of Duntish were baptised 27.8.1669 but there are again no parents.
There is a quarter session record for Edward and Anne and their 2 children and an apprentice being moved from the parish of Woolland back to Buckland Newton in 1697.(on Ancestry)
Edward Mullet 's Will for 1717 is on there too.A taylor of Duntish Buckland Newton.
son John Mullett one pound
granddaughter Elizabeth 40s and a pewter dish once she is 14
grandson John 20 s a great knife
graddaughter Sarah something from the Great Hall
granddaughter Abigail one feather bed.
To my grandchildren Richard,William,Robert ,Anne and Elizabeth children of my son Edward £10 to be divided between them.
Elizabeth daughter of Edward one pewter dish
The rest goes to his son Edward Mullett.
Made 9.12.1716.
So plenty to go at there.(I'm presuming he's the father of the Edward and Richard bapt 1669 who married 1695)
There's a marriage for Edward Mullet and Margaret Wakford of Buckland 21.5.1663 by licence at BN which fits nicely.But she is buried 28.7.1663 and Edward seems to remarry to Sarah Dampney 12.1.1664/5 again by licence.
Sons John 24.1.1665/6 and Robert 5.2.1771/2 and Samuel to Edward and Sarah 8.5.1677
There are some Vincents in the parish but can't see any Brakes.
And there is a gap in the records 1629-1654 which makes going backwards difficult.
Ciderdrinker