My fiance was born in Spain to a British father and a Czech mother, and has a certificate from Spain. But a divorce led to her mother moving her to Czech, where she has lived nearly all of her life. Her mother evidently obtained a birth certificate for her in Czech at some point (Czech law requires notification within 3 days of birth but am unsure if this has always been the case or what special exceptions may have existed at the time). The Spain birth certificate lists both parents and uses her father's surname. The Czech birth certificate lists only her mother and uses her mother's divorced name. Later in life, her mother remarried, resulting in a surname name change in Czech. She has since (as an adult) moved to the UK to live with her father and obtained British citizenship and has been employed and taxed there for going on 2 years now. Her Czech and UK passports reflect the surname of her Czech mother's second marriage. My question ultimately is which birth certificate should be used for the K1 requirements? The Czech certificate is legally valid, and her british citizenship speaks to her being the legitimate child of her father, so would USCIS care about the Czech cert not showing the father's name?
