Yes correct, i-864W is the one requested now.
In many places it seems I need to choose 1.a. and not #2, hence my confusion on why not to submit as a preparer and in the forum, there are a lot of contradicting answers... In the form instructions it only says that as a minor, the parent is the one that "should" be filling and signing the form, so it makes sense to have that, but should we fill 1.a. or 2. under part 3, this is my concern now.