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It looks like you're looking at the same family as james79. Parish records have come online since this post from 2006.
1841 census Pendre St, Cardigan HO107/1378/2 folio 33 pg 15
William Edwards 30 Sail maker not born in county
Elizabeth 30
David 8
Mary 5
John 2
all born in county except William
1851 census Pendre Street, Cardigan
William Edwards head mar 43 sail maker b. Pembs, St Dogmells
Elizabeth wife 41
John son 12
James son 9
Elizabeth dau 9 twins
Margaret dau 6
Thomas son 3
all born Cardigan except William
burial 13 August 1855 at Cardigan St Mary for William Edwards 47 of Pendre Street
birth registration for twins
James Edwards march qtr 1842 Cardigan vol 27 pg 46 mmn Morgans
Elizabeth Edwards march qtr 1842 Cardigan vol 27 pg 46 mmn Morgans
& for your relative
John Edwards dec qtr 1838 Cardigan vol 27 pg 32 mmn Morgans
Baptism 15 Nov 1838 John, son of William, sailmaker, and Elizabeth edwards of Pendre Street.
possible marriage in St Mary's, Cardigan 22 May 1828 for William Edwards bachelor of St Dogmells & Elizabeth Morgan of Cardigan, witnesses David Williams & John Lewis, all sign except Elizabeth.
There are several Edwards families in St Dogmael's. The parish register around 1808 is a bit untidy. There's a John & Elizabeth Edwards having children but he is a farmer on later baptisms.
There's a William, fisherman, & Margaret and William or possibly both parents are dead when son William is baptised 25 Dec 1814.
Also a John, fisherman, & Mary and a John, fisherman, & Margaret.
I think David Edward & wife Magdalen can be ruled out as there's a possible marriage 25 Nov 1815.
Always a possibility that there is not parish baptism if his family was non-conformist.
