The word MOTHER doesn’t appear.
Citizenship by Descent
5.(1) Subject to the provisions of this section, a person born after the commencement of this Act shall be a citizen of the United Kingdom and Colonies by descent if his father is a citizen of the United Kingdom and Colonies at the time of the birth:
Provided that if the father of such a person is a citizen of the United Kingdom and Colonies by descent only, that person shall not be a citizen of the United Kingdom and Colonies by virtue of this section unless
(a) that person is born or his father was born in a protectorate, protected state, mandated territory or trust territory or any place in a foreign country where by treaty, capitulation, grant, usage, sufferance, or other lawful means, His Majesty then has or had jurisdiction over British subjects; or
(b) that person’s birth having occurred in a place in a foreign country other than a place such as is mentioned in the last foregoing paragraph, the birth is registered at a United Kingdom consulate within one year of its occurrence, or, with the permission of the Secretary of State, later; or
(c) that person’s father is, at the time of the birth, in Crown service under His Majesty’s government in the United Kingdom; or
(d) that person is born in any country mentioned in subsection (3) of section one of this Act in which a citizenship law has then taken effect and does not become a citizen thereof on birth.
(2) If the Secretary of State so directs, a birth shall be deemed for the purposes of this section to have been registered with his permission notwithstanding that his permission was not obtained before the registration.
Did you read the definitions, yet?????????????????????????