You didn't mention which of the 3 EB-1 categories you're looking at. I'll assume it isn't executive/manager. But, there is still: EB-1A:...

Can a friend sponsor a F1 Visa

Yes, it is possible ... as long as there isn't 'more' than just a friendship involved.

How can we accelerate US green card process? Sister filing for other 2 sisters

I'm sorry to hear about your parents. But. this can't be a reason for expediting your sisters' papers. Talk to an immigration attorney via...

Q: i. will the i94 with extension expires 6 months before passport expiry, that is, end of this year? A: This is a good example of why people...

I don't see a problem here ... you already have an unrestricted greencard.

Can my father be denied from getting green card if on his i94 shows transit after he remained in the U.S.?

We need more information than just the word 'transit'.

Collecting unemployment shouldn't impact on the two AOS procedures (Adjustment-Of-Status) nor (Affidavit-Of-Support).

Is it possible to do go from an E-2 visa (primary holder) to an F1 ?

Yes, it is possible for an E-2 primary to apply for a COS to F-1 ... BUT, make sure you have a good cover letter, explaining your NON-IMMIGRANT...

I94-validity ended on 01/09/2020, received denial notice for my H1B petition on 03/03/2020. When does my out of status start?

Your grace period is 60 days from the date of the H denial. There is no 180 day grace period in your case. You can stay, even if it is beyond...

American citizenship for green card holder

I am concerned about your 2 year absence from the US. It is quite likely that CIS will claim that you abandoned your greencard ... even if you...