You can upload it now but it is not necessary.

Your sister’s actions after entering on a visitor’s visa will have no bearing on your status.

It may be prudent to update SSA especially if you changed your name.

Your status in the U.S. does not have any bearing on your rights and obligations as pertains to the child. You can seek custody or visitation.

I would ask the consular staff your question. You could also reach out to USCIS.

Did you speak to the attorney who prepared the extension request? What did he/she/they advise you to do? You need to depart as soon as possible as...

Possibly. It really depends upon the type of property and value. It is not as simple as saying you have certain property. It would be easier to...

You could seek to file a mandamus action. However, this may not end with the results you hoped for.

You should have no issues naturalizing if you remain outside the U.S. for less than six months. This assumes you are otherwise eligible for...

A new employer could attempt to transfer the H-1B petition, but it is not guaranteed to be approved.