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 The only Sinnott in Wexford Town in the 1800s who was in the fabric business
 (that I can find ) was Charlotte Sinnott ,Draper of Main St. Wexford.

Charlotte Sinnott is a wee bit of a mystery.   There is a death and probate record Charlotte, spinster dying  21 may 1915 (death cert place Rockfield, Wexford, probate gives address as of South Main St, which matches with census records, and late of Rockfield House).  Her birthdate from these records could be anything from around 1850 to 1853, however the only birth I can find at all is one in 1847 (if she died a spinster with no family around, then perhaps age at death was only estimated).  Probate was granted to administrators Hugh M'Carthy Hotel Proprietor and Elizabeth hore Widow.

If she is the one born in 1847, then it is this microfilm https://registers.nli.ie/registers/vtls000634138#page/1/mode/1up    born 28 jan, bap 29 jan 1847 in Wexford, diocese of Ferns to parents James SINNOTT and Anne CULLIMORE.  There are two earlier children to the same parents:  Robert (15/16 feb 1841) and Daniel (13 jul 1843).  I can't actually find anything more about this family at the moment though. 

Hi Brummie,
This is the wrong message topic for Idlicote School, but I have sent you a personal message (log in and check under MY MESSAGES at the top of the page)

This offer of a discounted Y-DNA test for a someone with Welsh Sinnett origins still stands.  Please read the original post for more details.

Also if any S-NN-T (any spelling variations) men have taken a Y-DNA test through familytreedna.com, I'd be really pleased to have them join the Sennett/Sinnott (and variant spellings) project - there is no extra cost to join projects.  Please PM me if you need any further information.

For the women family historians - I know I have asked for men testers only, but you can play your part by either encouraging your menfolk to test, or by financially contributing to the cost of the test.

The position now is that we have the names of the two parents, 6 children and 12 godparents, from births spanning 1803-1821, with which to try and reverse engineer if we can get a match to possible births to the parents and siblings, and their parents, back in the 1770-80s. The results of this matching/identification exercise might change if the godparents were grandparents as opposed to uncles/aunts. There is no "perfect" match, it will be a question of deciding if there are any, or one or more reasonable matches 

Rather than trying to "reverse engineer" by using godparents, if you now know the names of 6 children in order, can you make an educated guess of the next generation back by using the typical Irish children naming patterns?  Doesn't always work, but worth a try - first son after fathers father, 2nd son after mothers father, 3rd son after father.. first daughter after mothers mother, second daughter after fathers mother, third daughter after mother...