-No, leave it blank. You need to choose "Yes" PART 3 Item 1 only for both I-864s, respectively for your parents.
相應的ITEM7則應為1還是2。太謝謝了。還是Confuse,不放心.
-Enter "1" there. But you need to put "1" in PART 5. Item 6 in both I-864s, respectively for your parents though they do not get the green card yet (but will get it later). Thus, your total household size will include both your parents.