I'm a US citizen, and my daughter's father is a Mexican citizen. I live in El Salvador. Getting ready for her birth in August, I've been gearing up to do all the paperwork at my embassy to register her as a US citizen born in another country. However, I've come to learn that even though my daughter only needs one parent to transmit citizenship (me), BOTH parents are required to attend the consular interview. But her father lives in Mexico, has never left Mexico, and actually doesn't even have a passport. So what's the solution? As it was explained to me, the easiest way is to leave him off the birth certificate. The way that the system is set up makes it easy for me to transmit my citizenship to her as a single parent, and potentially impossible if her father's on the birth certificate (because even if he has a passport and is able to fly here, there's no guarantee that he will pass immigration in order to attend the interview). It's ridiculous and frustrating to me, because the system is basically set up in such a way that incentivizes me to legally disenfranchise him.