1. I-134 is not necessary.
2. It is better to submit 156 online. Then you need print it and write some Chinese according to the form instruction (such as parents name, address et al.) If you don't fill online, you need fill both in Chinese and English, also it is slow your parents to apply visa.
3. I-157 is not necessary if apply B2 visa.
4. 7500 is not too good. But you can prepare your salary stub or w2 form et al. And you need prepare a letter from your institute to state your position and salary. They should be enough.
2. It is better to submit 156 online. Then you need print it and write some Chinese according to the form instruction (such as parents name, address et al.) If you don't fill online, you need fill both in Chinese and English, also it is slow your parents to apply visa.
3. I-157 is not necessary if apply B2 visa.
4. 7500 is not too good. But you can prepare your salary stub or w2 form et al. And you need prepare a letter from your institute to state your position and salary. They should be enough.
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