Hi, Sirname in my father's passport is missing but in my mother's passport, "Spouse Name" section has full name of my father with sirname. I read somewhere that I can still apply for the visa and I should use 'FNU' in first name and my father'sname in Sirname. I am planning to apply a B2 visa for them and they both will go together for the visa. Please advise if this is fine? Also, please advise what name I should fill in B160 and I-94 card for him? Thanks in advance.