Context: They were really nice and the grandma was so sweet . The grandpa asked when Oma left Germany , and I said around \' 55 and he nodded and said , " She was right , she was right , " So that was funny . The grandmother \'s name is Johanna , but I do n\'t know the grandfather \'s name .
Question: What may be the reason why they do n't know the grandfather 's name ?
Option 0: None of the above choices .
Option 1: They were n't supposed to know it .
Option 2: They are undercover .
Option 3: They are in the witness protection program .
Answer: 0