I'm wondering what documents I need to apply for Irish citizenship through my grandfather? I have birth certificate of grandfather and birth certificate of mother who never married so she still has my grandfather's surname, I also have death certificate for grandfather but no passport or wedding cer...

I'm wondering what documents I need to apply for Irish citizenship through my grandfather? I have birth certificate of grandfather and birth certificate of mother who never married so she still has my grandfather's surname, I also have death certificate for grandfather but no passport or wedding cer...