« Reply #1 on: Friday 28 June 13 12:53 BST (UK) »
Only John Waters marriage that comes up on FindMyPast is in Tenby in 1788 to Anne Rees.
No John Waters burial in Dale in 1820, and clearly not the one you're looking for but there's one in Dale for Hugh, John, Allen Frowler(?) Waters on 19 June 1818, aged 5 months, abode Towns End. Commas between the names but no mention of more than one child.
CARDIFF:Lord,Griffiths,Barry,Cope,Mahoney ~ PEMBROKESHIRE:Griffiths,Rees,Owen,Thomas ~ ESSEX:Lord,Foreman,Hatch ~ SOMERSET:Lord,Cox,Hockey,Linham,Bryant ~ STAFFORDSHIRE:Cope,Elks,Hackney,Gallimore,Davenport ~ SUFFOLK:Lord,Lockwood,Hatch,Rix,Foreman ~ IRELAND:Barry,Meany,Cummins,Grogan ~
PONTYPRIDD:Leigh,Brooks,Adams,Davies,Thomas ~ KENT:Leigh ~ CHESHIRE:Adams,Tudor,Illidge ~ DENBIGHSHIRE:Edwards,Bolas ~BRECON:Leigh,Thomas,Davies ~SOMERSET:Adams,Keitch,Bridge ~ABERGAVENNY:Minton ~ MERTHYR:.....