Why is the California service center processing date for i130 petiton for LPR for spouse changING back and forth?

This is not uncommon as workloads shift and they are tying to give the most accurate estimate they can.

Any impact if a previously approved H1B with old compny is revoked after reentry thru H1B consular processing with new employer?

you don't really need any of these details. Your time in H-1B includes only the time you actually worked for them anyway in figuring your allowed...

Household member proper 864 form to fill out?

Yes all persons are considered in your household. You file I-864, your son files I-864 co-sponsor and your son's wife file I-864A as household...

I entered the US as a visitor and filed an I-485 Adjustment of Status. What is my current legal status in the US?

If the i-94 card attached to your visitor entry is still valid then you are a visitor as your status. If not you have no status but are in a...

Do minors become citizens when parent or parents do?

sometimes this is automatic. Were you a permanent resident before your 18th birthday and in your father's custody.

Can I restrict husband from using our marriage to petition to all his family once he gets citizenship through me?

No you cannot restrict this -- the citizenship belongs to him.

Too many details to respond on an internet forum without reviewing the actual documents as well as the RFE.

Is it okay to leave US a day after I485 interview?

If you have a valid advance parole (travel permit) then ok to leave; otherwise wait for the green card and attempt to get a stamp in your passport...

Bring a corrected page for the I-485 to give the Officer at the interview and explain the inadvertent error.

There is always a chance but he should be ok