Hi Sue
I've been looking at the Parris's - half a story!
The Parris' living next door to James Sellars in 1851 were:
John Head M 30 Anniutant B. Colyton
Elizabeth Wife 35 ~ B. Chard, Somerset
Elizabeth Mother 36 ~ B. Axminster, Devon
This last is obviously (

) incorrect, at least her age must be.
John Parris was baptised at Colyton 31 Mar 1822, he is obviously Sarah and Elizabeth's brother.
In 1841 he was living alone in Colyton, of independent means.
A John Parris married Q4. 1848 Axminster to Elizabeth Quicke.
That is the only John Parris marriage to an Elizabeth that I can see between 1841 and 1851 in Devon or Somerset.
I can't find mother Elizabeth in 1841 - not sure how old she was, whether she was already a widow and where she was living.
So - there is - as I said - half a story - and I'm now going to call it a day !