There's lots of ways to get Irish citizenship. I'll list them all out:
If you do not have the citizenship of any other country you get Irish citizenship automatically, if you are born in Ireland.
No. You can only gain Irish citizenship from descent if your grandparents were born in Ireland. Unfortunately you seem to have missed by a generation. You could still gain citizenship by actually residing in Ireland.
The consequences about citizenship was.....
Irish, because the Irish Nationality and Citizenship Act of 1956
You can't claim citizenship by a ancestor. My family came from Londonderry Ireland in the 1600's to the Virginia colonies, but I can't get Irish citizenship from Ireland because they were Irish. You have to be born in a country to claim citizenship or have a parent from a country to claim duel citizenship.
Potentially, yes. If the child has parents or grandparents who are Irish, then they can. There are lots of other ways that someone can be entitled to Irish citizenship. See the website below.
Yes. See here for details on how to take up citizenship. http://www.dfa.ie/home/index.aspx?id=267
Yes, you are a full Irish citizen, eligible for an Irish passport, a member of the EU.
By law, the Irish government can recommend honorary Irish citizenship for someone who has signalled honour or rendered distinguished service to the nation. The President of Ireland can then officially grant the person honorary Irish citizenship.
Up until recently Irish citizenship laws changed due to overpopulation of illegal immigrants who were claiming citizenship in order to claim welfare, mainly from deprived nations. Before this the law allowed anyone born in Ireland to be a citizen, now this does NOT grant you citizenship. For more information: http://www.citizensinformation.ie/categories/moving-country/irish-citizenship
Not that I'm aware of, although he can claim Irish dual-citizenship as his grandparents were both Irish.
I am an Irish Citizen and wish to become a Barbados citizen
People in Northern Ireland can have British or Irish citizenship.