Visitor (B1/B2) VISA Extension During Coronavirus Pandemic?

She should depart right away if the application is denied. She may remain in the US while the petition is pending.

Student visa do i have to file i-864A and add my income from uber

Yes you should disclose all employment truthfully.

I agree with my colleague - you cannot withdraw his petition, only that it is jointly filed.

Should I apply for my mother as an Alien relative or as a visitor?

It is not advisable to have your mother enter with the intention to apply for permanent resident status. Best to consult with an attorney to...

You would indicate your travel while CPR in the last 3 years.

If my brother its a citizen?

He may apply for you but the visa petition will take 10-12 years to become available.

About denied I-485 application due to a missing document

You will need to provide the fee if the application was previously rejected.

No it does not appear a new form would be needed based on information provided.

Best to work with an attorney for any RFE response.

What happens if you are a conditional resident but also have got a denied asylum case?

Your information is unclear - If you have a CPR status, the asylum would not be needed.