although it won't tell you fathers names unless he was a witness.
Sometimes you get lucky and find a brother or sister witnessed the marriage, which is why one step at a time is best rather than guessing at an age and looking for a baptism, not easy in a whole County.
The 1841 census might help
Rookrey, St Woollos, Monmouthshire
All born in County
David Fox 31 Mason
Elizabeth 25
Benjamin 5
Maria 4
Roseanna 2
Two dwellings away was this family, you may want to keep them on file in case they are connected
Isaac Fox 74 Labourer No
Ann 75 No
Isaac 33 Labourer Yes
Charles Symons 15 Labourer Yes
HO107; Piece 751; Book: 15; Folio: 23; Page: 14