I am going to apply B-2 Visitor Visa for my mother-in-law, is my wife's birth certificate required to verify our relationship? The problem is that my wife couldn't find her birth certificate, and we don't know how long it is going to take to get a new one. We don't want this to hold up her visa process, I am wondering if the VO will deny her visa b/c she doens't have my wife's birth certificate. Any comment is appreciated.