You only need an SSA letter if you become a permanent resident while 18-26.

H1B petition approved by Emp A, then transfer rejected by Emp B.

This depends on why the second was denied.

I-130 process time for brother and sister

You need to go to mypriority date.com to get an estimate.

Please, I wanted to know if I also have to pay for the form I-765 (employment card) if am concurrently?

No you don’t pay an extra fee. It is included in the I-485 fee.

If I have a conviction for Misdemeanor disorderly conduct can applying for unemployment jeopardize my green card?

That should have no impact on your permanent residence. Doesn’t your attorney know this?

Can I stay in US and Study on pending 539 ( COS from H4 to F1)?

You need to consult with your attorney. AVVO is for people who might need an attorney.

Can we file H1 transfers with 2 employers simultaneously?

If the Hs are full-time you can only work for one at a time. If both are part-time you can work for both at the same time.

Since the denial is based on the withdrawal you should not have problems.

Can I apply for H4 EAD while H1B is in process?

You cannot have two types of status at the same time so I do not see any benefit to this strategy.

H1B extension denied after 2 months of approval

The denial notice is what controls, not the online information. There is no reason to lost a "specialty occupation" RFE so you should immediately...