Thank you! Yes, I had my husband start filling out the regular I-864 after my last post on this thread. I figured it was better to be safer than sorry with a potential RFE.
Thank you for clarifying household size. I read so many things online on how my I-864 would only show 2 people, myself and my husband sponsoring me. And the children's I-864's would only show 3 people - my husband, myself, and the one child. It was beyond me what the logic was for calculating that way and not having all 4 of us in each I-864. Thank you for clarifying that each form SHOULD have a total of 4 after filling in respective boxes depending on principal applicant.