How to apply B2 Vista for my dad?

I had applied my dad for 1-130, and got approved. But my dad changed his mind, so I didn't continue. BTW, he currently is in Beijing. Now I am trying to apply B2 for him since my mom got her green card last year and still staying with me. My question is beside DS-160, what else do I need to prepare? Do I need invitation letter, financial support? Thanks

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回复:How to apply B2 Vista for my dad? -863211- 给 863211 发送悄悄话 863211 的博客首页 (670 bytes) () 01/02/2012 postreply 20:12:12

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