« Reply #7 on: Wednesday 16 May 12 21:18 BST (UK) »
I think what you should do is start out on the Ireland forum and see if you can get some names and dates for these hypothetical siblings. With that information, it will be possible to poke around in the US and Canada to see if there is any sign of them in the New World. As it is now, the search is impossible because we don't know what we're looking for and so we wouldn't know it if we found it.
Wiltshire: Banks, Taylor
Somerset: Duddridge, Richards, Barnard, Pillinger
Gloucestershire: Barnard, Marsh, Crossman
Bristol: Banks, Duddridge, Barnard
Down: Ennis, McGee
Wicklow: Chapman, Pepper
Wigtownshire: Logan, Conning
Wisconsin: Ennis, Chapman, Logan, Ware
Maine: Ware, Mitchell, Tarr, Davis