Do I need to submit all the forms at the same time to get my Green Card or there are specific deadlines/steps for each?

For things to run smoothly all forms should be filed together. In addition to your list an I-864 form is also needed along with passport style...

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Can green card applications be filed concurrently?

If he was alreqdy 18 when you married his father you can not petition him and he must wait for his father to get a green card. Depending on where...

They need to be here for filing but can then leave after filing and have permit sent to US Embassy in your country.

I-130,I-485 concurrent filing for sibling

He can not file an i-485 based on your I-130 filing unless the priority date (filing date) is current - meaning you filed for him many years ago.

How can I get out of a marriage with a non citizen ?

Just dont show up at lawyer or interview, he cant proceed without you. Consult a divorce lawyer if you dont want to be married to him any more.

My friend got a 10 year greencard in his first greencard marriage base interview. How long should he wait to apply for citizens?

Who sponsored him for Green Card? If US Citizen spouse 3 years if they are still married. All other categories its 5 years. One can apply 90 days...

Im a bit worried, we sent in our application for adjustment of status- its been 3weeks and I haven't received my receipt yet.

Did you check and see if the check/money order you sent was cashed? I would expect you to hear by the end of this week.

I do not want to attend 2nd interview what are my options ?

No one can force you to go to the interview or to stay married.

How will I know if they don't require a 2nd interview?

You can always make an infopass appt and gonin and ask the status and maybe get them to review file.

When that notation I485 pending CR6 means to have a second interview?

Only if they re interviews ee before approval or approve before you are married 2 years.