Hello Monica, no I'm not the grandchild of someone born about 160 years ago!!
At the moment I don't have a lot more to add about the Gorey line than what's already out on rootweb & rootschat forums, where at least three others are researching this line. I can tell you though that Nicholas is a not a strong name in the Jackman lines so that's helpful to you. M Jackman has your Thomas' wife as Georgina (which may show she was English rather than Irish, or at least Protestant).