Back to 1881
I Wye Side, Chepstow RG11/5219 folio 67 pg 59
Thomas Pidsley head widower 37 general lab b. Glos, Cam
Thomas son 18 general lab b. Cam
William son 15 errand boy b. CamEmily dau 8 scholar b. Cam
Can't find a birth for Emily in Gloucestershire, but there is one in Clutton, Somerset
Emily Mary Pidsley mar qtr 1873 Clutton vol 5c pg 627
and in 1871 in Stanton Drew covered by Clutton registration district
RG10/2468 folio 2468 folio 63 pg 13
Thomas Pidsley head mar 30 labourer b. London
Elizabeth wife 31 b. Devon, Bampton
Lucy Hannah dau 10 b. Devon, Topsham
Elizabeth dau 9 b. Hants, Gosport
Thomas son 7 b. Hants, Gosport
William son 5 b. Sussex, LewesSylvia Sarah dau 6 months b. London
can't find a birth reg for Sylvia, but there is a Sylvia Pidsley who marries sept qtr 1891 Chepstow vol 11a pg 25. She is on 1881 census as niece to Mary Liscombe and gives her place of birth as Shepton Mallett RG11/2388 folio 51 pg 31
There is a Lucy Anna Pidsley registered june qtr 1860 St Thomas (covers Topsham) vol 5b pg 61
and this possible for William
William J Pidgely june qtr 1866 Lewes vol 2b pg 152
death reg for Elizabeth
Elizabeth Pidsley aged 36 sept 1874 Cheptstow vol 11a pg 8
Back to 1861
Sidmouth Rd, Sowton, Devon RG9/1386 folio 18 pg 6
Thomas Pidsley head mar 20 labourer in brickyard b. Devon, Sowton
Elizabeth wife 21 b. Bampton
Lucy Anna dau 1 b. Topsham
in the same house as
John Pidsley 66 ag lab b. Topsham
Mary wife 63 b. Littleham
and next door to Richard Pidsley - parents and brother possibly?
marriage reg
Thomas Pidsley dec qtr 1859 St Thomas vol 5b pg 158 - 2 Elizabeths on page
Going forward
1891, Woodcroft, Tidenham ( next to Chepstow but in Gloucestershire) RG12/4336 folio 134 pg 2
Thomas Pidsley widower 50 engine driver stationary b. Clyst St Mary
Elizabeth Kingston dau mar 29 b. Devonshire
Fred Kingston son-in-law 43 quarryman b. Devonshire
William F grand son 3 b. Northampton
Rosa Eliza grand dau 2 b. Northampton
Emily M dau 19 b. Northampton
Elisabeth M grand dau 2 b. Glos, Tidenham
think the enumerator made a mistake with his ditto for place of birth moving Emily's birth to Northampton. Clyst St Mary is 2 miles from Sowton.
You would need some certificates to prove all this. Either or both of William's marriage certs would confirm his father's name and occupation and show if these census entries are correct or not. With the GRO ref, you can order certs online here
http://www.gro.gov.uk/gro/content/Thomas evidently didn't have a good memory for places, but the combination of names within the family and their ages looks consistent enough to show that they are the same people.
Hope this helps.