1. 当时回国的原因是奶奶的身体不好，希望他陪在身边。结果一耽误就是接近一年。用这个理由会被承认吗？
-Normally no. But not hurt you to address it.
2. 我一直都在美国，报税的时候还把他放在dependent，他一直想回来，国内不适应，但是那边不放。这种情况怎么陈述比较安全？-Just say: his grandmom in China got sick, and he just wanted to stay with his grandmom for more time because he loves her grandmom so much. He was still a minor at that time, so he of course came back to US to stay with you under your guardiance (family tie) after that period of time.
3. 什么类型的材料比较好？例如奶奶生病？我报税的证明？
-Both, if possible.
