The US spouse is always the
You can't.
The US citizen spouse MUST be the original sponsor whether they meet the poverty guidelines or not.
Your parent (one of them) can only be a joint sponsor or one can be a joint sponsor and the other, their household member/Co-sponsor.
Do you (You, K1, dad and mom) all live together? That changes everything even further.
You may be required to provide a new, updated I864 at your AOS interview and yes, you can change whatever you like.
PLEASE fill in your TIMELINE as required to be a member here.