Pursuant of Section 7 of the Irish Nationality and Citizenship Act 1956, you are automatically entitled as an Irish Citizen to a Passport or to Irish Citizenship if you fall into a certain number of categories, be that you’re the child of an Irish Citizen or that you are the grandchild of a person born on the island of Ireland.
There are certain processes that you may have to go through if one of your grandparents was born on the island of Ireland and one of your parents was not born on the island of Ireland there’s a separate process known as the Foreign Births Register but other than that the other way to get Irish Citizenship is generally through the Naturalization Process which is normally based on residency but the minister can make exemptions based on Irish associations.