I-864 Part3 question9 and Part5 question 21a-g

[pinoy339]

hi guys, just paid AoS bill online and getting ready to receive and fill out form i864 so i need all ur help once again particularly on part 3 question 9 and part 5 question 21a-g
i will show u how i would answer those questions based on how i interpret them and pls correct me if im wrong
heres my situation
i am the petitioner , green card holder
beneficiaries are my wife and my 6yr old son
my sister ,who i live with ,will be acting as a household member to help me meet 125% poverty guideline for household of 4 (me,my wife, my son, my sister)

i864 for wife **** **** **** **** **** * i864 for my 6yr old son
part 3 **** **** **** **** **** **** **part 3
question 9 **** **** **** **** **** ** question 9
[tick check box] **** **** **** **** * [tick check box]
put N/A not applicable or leave blank ** put n/a or leave blank
because my wife and my son has their own separate visa petition, correct? as stated in the instruction.

part5 **** **** **** **** **** **** ** part 5
21a = 1 (my wife) **** **** **** **** * 21a = 1 (my son)
21b = 1 (myself the petitioner) **** **** 21b = 1 (myself)
21c = 0 (my wifes already in 21a) **** * 21c = 1 (my wife)
now 21d a little tricky for me
21d = 1 ? (put my son here even **** **21d = 0 (hes already in 21a)
though i never declare him
as a dependent? on tax returns)
21e = 0 **** **** **** **** **** **** * 21e = 0
21f = 0 **** **** **** **** **** **** * 21f = 0
21g = 1 (my sister) **** **** **** **** 21g = 1 (my sister)
total = 4 **** **** **** **** **** **** total = 4

pls verify if my intended answer are correct, otherwise , pls correct me thanks
all inputs will be very much appreciated thanks!

[daru786]

Is your sister really your household member? If not just ask her to fill a I-864a.

[pinoy339]

Is your sister really your household member? If not just ask her to fill a I-864a.

yes my sister and i live together, same residence, and i know she will have to fill out i864a , the contract between us

my concern or question is if my intended answers for the i864, that i posted are correct ... i just need verification from you guys , tnx