United Kingdom - Passport & Nationality - NEW - British Citizenship by Discretion (Pre 49 Ireland Father)
The claim stems from the applicant's birth before 1949 in a foreign country, their father's birth in a foreign country before 6/12/1922 and the paternal grandmother's birth in Ireland.
In this case, we would argue that the Paternal grandmother was a British subject by birth and, had the law been gender equal, she would have passed on her British subject status by descent to the father. In turn, the father could have registered the applicant’s birth at the British consulate resulting in the applicant becoming a British subject.
On 1.1.1949, the applicant failed to become a Citizen of Ireland (you needed to be living there for 7 years before 6/12/1922 or have a parent born there). As a result, the applicant should have been automatically re-classified as a Citizen of the UK & Colonies and had the Right of Abode through a grandparent's birth in Ireland. Such a person should be a British citizen in the modern day.
The above assumes that the mother is not born in Ireland and no claim to British citizenship stems for her.