Some final comments to OP:
Are you relying on commercial transcriptions and indexing of the parish registers to look for Ferns baptisms and marriages, or did you look in person?
Commercial indexing can be quite unreliable - they tend to misread difficult entries, or unfamiliar names. Once I know a location for one of my own families, i always consult the originals myself.
Also, as James was obviously moving around, there may have been children earlier than 1832, or in the gaps, etc. Have you looked for other later Tobin marriages with father James? Just as a possibility.