There is a Robert Westlake burial at Puriton 1 Jan 1833, age 94 (on FreeREG). So he was born around 1738.
And Sarah Westlake buried 3 Aug 1806, listed on the Somerset RO transcriptions, but it doesn't give her age.
Daughter Ann Westlake baptised 18 May 1766, and son John baptised 17 Jan 1773, in addition to Richard and Robert who you already have.
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