谢谢8老师的回答，但是您说的有个问题不是太明白，麻烦再看一下。But you need to put "1" in Item 6 of Part 5 and thus, your mom will also be counted into your Household size.
Item 6 of part 5, if you have sponsored any other persons on Form I-864 or.....who are lawful permanent residents, enter the number here. 您说这里填1，可是我妈妈还没有拿到绿卡呀。麻烦您能确认一下吗？谢谢
-It does not matter whether your mom gets the green card or not now (she will get it later, anyway) , just put "1" there so that your household size will include your mom.
还有关于I-864a的问题，part 5 中intending immigrant number是填1，只填我爸爸的信息？-Yes.以及part 6中intending immigrant number都是填1吗？-Yes.（当时申请我妈妈一个人的时候是填1，现在2个月后申请我爸爸，需要加上我妈妈吗？-No. These two cases are irrelevant）谢谢！
