The first one is not correct. You can say "你的爸爸的名字是什么？" It's correct in grammer but sounds peculiar. The last one is true. It can be simplified as “你爸爸叫什么？” But it is a little impolite if you say it just in front of 'the father' in the context but okay if behind him. You can say "令尊尊姓大名?"
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Has difficulty understanding even short answers in this language.
Can ask simple questions and can understand simple answers.
Can ask all types of general questions and can understand longer answers.
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