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This is a classic example of several people with the same name being born in the same area in the same year!

You can see that Edward PRICHARD is not a part of the ROBERTS family by the way the census is marked in 1841.  He is a separate person within the same household.

Yes, that plus the fact that he's not listed sequentially, by age, suggests he's not a child of the family.

You have access to Welsh records on FamilySearch
You first need to have a look at Edward's marriage record to see who his father was and his father's occupation.

According to his 1861 marriage certificate, his father was John Roberts (labourer) but that's not necessarily so. It looks as if he'd been fully accepted as the son of John & Catherine, as evidenced by the 1851 and 1861 censuses.

Two Edwards, one the son of Zachariah PRITCHARD and Jane and the other the son of James PRITCHARD and Margaret (both mothers were maiden surname WILLIAMS) - both of those boys appear to be with their own families in further census records.

Either one of these Edwards would have been a likely candidate, but for the fact that they are 'with their own families in further census records'. Blast!

Maybe you will need to follow all of the Edwards baptised to see if they appear in 1841/51.

It looks like that's what I'll have to do! Thank you all for your help.

The GRO website has turned up the births of 2 RAWLINGS/DICKS daughters, in Pontardawe, 1913 and 1915. Could this be why you haven't been able to find more children and the deaths of Alfred and Emily - they moved to somewhere totally different?

The National Archives has a record

Medal card of Thompson, Albert John
Corps: Royal Field Artillery Regiment No:...

Reference:   WO 372/19/218444
Description:   Medal card of Thompson, Albert John
Corps   Regiment No   Rank
Royal Field Artillery   75519   Gunner
Labour Corps   274565   Gunner

Is this your man?

As for post war records, have you looked in Electoral Rolls?

Good hunting!

If you've already seen the baptism record, you'll know Richard's wife isn't given. Nor is there an earlier marriage of Richard in the Coaley records (not that Ancestry have transcribed, anyway).
For what it's worth, there's a James Gunter baptised 5 January 1723/4, son of Edward. And there's a marriage of Richard Gunter and Martha fforde (I think that's what it says) in Frocester 24 December 1728. A second wife for your Richard? Because Hannah, dau. of Richard Gunter was bapt. in Coaley 12 September 1727, but died and was buried on the 15th, and then on 2 November, Ann, wife of Richard Gunter was buried, also in Coaley.
Maybe you'll have to widen your net for the marriage of Richard and Ann.