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怕自己的工资不够多，所以想加上LG一起CO－SPONSOR。但是LG现在还不是公民，只是绿卡，可以吗？
-Yes, but he is not called as a co-sponsor because he is your spouse (same family member), and he can allow you to use his income for the support in your parents' green card applications.

另外，他需要填什么表格？多谢了。
-He just needs to file the I-864A together with your I-864. I-864A is equal to a contract which allows you to use his income for your parents' green card applications.