It ain’t cheap - just to get citizenship is gonna be about €300 for over 18’s and that’s before the price of a passport for grandkids, but if you have an Irish parent then I think you are automatically a citizen and can go straight to getting a passport…Sláinte
The trick to a successful xmas day is to time your alcohol intake so that you pass out by 7pm and are oblivious to the family getting on each others nerves. Then waking up on boxing day and asking why no one is talking to each other.