Rfe for joint sponsor for my step child

[Helen Latimore]

Hi,I received an RFE from uscis for my step son,requesting that (1) I get another joint sponsor and (2) that I fill another i-864 for my step son.My question is this, who do I put as the principal immigrant in part 2 1-1c?In part 3 number 1,do I click yes or no?Also, part 3,4a-8 do I leave it blank or write my wife's name as family member (I also filled for my wife but no RFE came for her).In part 3,29 what number do I write there since the RfE is only for my step son can I write just 1?

[newacct]

Are you a US citizen or permanent resident? Did you file an I-130 for your stepson?