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  Part 5第6项是不是应该空着，因为864表此项的instruction 说 “Enter the number of lawful permanent resident whom you are currently obligated to support based on your previous submission of Form I-864 as a petitioning sponsor”?
-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.