同你家父無乜大關係:
https://www.legislation.gov.uk/ukpga/Geo6/11-12/56/enacted
PART II
Citizenship of the United Kingdom and Colonies
Citizenship by birth or descent
4Citizenship by birth
Subject to the provisions of this section, every person born within the United Kingdom and Colonies after the commencement of this Act shall be a citizen of the United Kingdom and Colonies by birth prrovided that a person shall not be such a citizen by virtue of this section if at the time of his birth—
(a)his father possesses such immunity from suit and legal process as is accorded to an envoy of a foreign sovereign power accredited to His Majesty, and is not a citizen of the United Kingdom and Colonies; or
(b)his father is an enemy alien and the birth occurs in a place then under occupation by the enemy.