How can I get my Jamaican born sister and nephew to the US and get their green card? and What is the cost if any?

You can petition for your sister. Her child(ren) would be derivatives on that petition.

Do i need to file for an Adjustment of Status if i was ordered removed by the IJ and was removed by ICE?

Do you have an attorney? You need one. That is not by any means simple to answer.

Is there a possibility i can get a B2 visa to visit my online boyfriend in the US?

You can apply. You are on the right track with the evidence you will need.

To answer the second part of your question: if you will be out of the country for longer than 1 year, you will need a reentry permit. If you intend...

What happens to your green card?

That’s a complicated set of circumstances. Probably won’t impact the Permanent Residence but if you are divorced before approval there could be a...

Can I travel with stamped passport only? Or is possible to have any difficult to re entry in USA?

What stamp do you have? Is it a temporary I551? If so, then yes. The form number for a green card is I551.

What will happen if I send all the requested documents to the uscis but forgot to include the RFE pink slip?

Hopefully you kept a copy of what you sent. My recommendation: resend immediately. The slip is required for proper handling of the response.

Did you have an attorney for the criminal matter for which you are on probation? Have you discussed travel with your Probation Officer? Passport...

Can I travel after my biometrics ?

What application do you have pending? N400? Short trips may be okay. I485? No travel would be my recommendation. Biometrics just means they...

What can I do?

Hire A good criminal defense attorney for him. Also you are likely to also need an attorney for him if he wants to keep/get custody of the...