Ireland
Irish Citizenship Through a Grandparent: Foreign Birth Registration Basics
If your grandparent was born on the island of Ireland, and both your parent and you were born outside Ireland, you can apply for entry on the Foreign Births Register. Source: dfa.ie
Once you're entered on the register, you're an Irish citizen and can apply for an Irish passport. You can't apply for the passport before then. Source: dfa.ie
The fee is €278 for people over 18 and €153 for under 18s, including return postage for your certificates, paid online. Source: dfa.ie
Your original certificates are returned by recorded mail at the end of the process. There's no public office; applications go by post. Source: dfa.ie
If your grandparent was born before 1864, when Irish civil birth registration began, a baptismal certificate is accepted. Source: dfa.ie