Well - the age for John is off, and so is the place of birth

Bitton is a long way from North Petherton

Strange they have the same place of birth for mother - maybe they too got it off the 1851 and couldn't read it

Certainly wife and children look OK, but I would be very leery about dad
Now - this is
pure speculation - I have been searching for a possible place of birth, and the nearest I can come up with is Aust - which is near Bristol, in fact these days it is the site of the Severn Bridge Service Area on the M4.