If you are flying Oneworld that day then you have access to the J lounge in Dublin operated by Aer Lingus; don't remember if that is called Gold Circle or something else (there is another lounge which seems to be not as good as the J lounge and might be a membership lounge). The bigger problem is that you are allowed 1 guest, so unless your wife is also Sapphire you may not be allowed in with 3 guests. The lounge itself is OK but not one of the better lounges in the world. No suitable facilities for kids and not much other than chairs and a few tables for anyone else. Good view of the tarmac though, so not bad for plane spotting which might amuse your kids for a while. The lounge also has an excellent espresso machine.