US Immigration from Taiwan

What is current wait time for interview for Taiwan?

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Is it necessary to bring a physical copy of the I-864 to interview?

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About how much time is there between notice that interview is scheduled and the interview? Consulate is Taipei, Taiwan btw.

How long does it take to get the IR1 visa after interview?

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A few questions regarding I-864

I'm the USC, my wife is the visa applicant, I have 2 children who are born US citizen, and I am using my brother(who doesn't live with me) as the joint sponsor.

1. So my household size is 4, my brother fills out I-864 and his household size is 2, is this correct?

2. On part 5 item 1, the answer is 1 (my wife). But on item 3 it asked me to enter 1 if I'm married, which would count my wife twice, what do I do here? Enter 0 for item 3?

3. On item 8 it auto-populates to 1, and I can't change it, what's up with that? Most of the fields I can fill in on the screen, but there are some I can't. Including part 5 item 8 where I can't edit the 1 which is obviously the wrong answer. What do I do?