I am British/English living in Spain 13 years, my partner is Argentinian lived in Spain over 15 years but still has Argentine Nationality. Our son is due in October, do I register him as British as I would like him to get a British Passport or do I have to register him Spanish or is this not possible due to my partner been Argentinian. I am planning a trip to the UK in December and he will need a passport either British or Spanish. How soon can he have a Spanish passport.