Can I self petition, I'm over 21 and unmarried?

may I suggest you consult with an experienced immigration attorney who can determine whether you are already a USC? No, you can not self petition.

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Do i need to wait for welcome letter if priority is current as per Date of filing or go ahead and sent i-485?

30 days from the date on the letter notifying you that the I-130 will be sent to the NVC send your I-485 to the NVC with all attachments. You do...

Is the baby going to have US Citizenship if born abroad, or would we have to apply for a visa for him/her?

The baby will be a US citizen at birth. As soon as possible after the birth your wife needs to go to the US Consulate near you and register the...

Will he get hold from the immigration? Are there legal rights esp now that he's old and sick?

more information is needed to determine whether there may be a federal warrant out for his arrest. If there is a warrant he may be taken into...

Can my married daughter or her kids apply for student visa for US after submission of my form i-130 ?Will it have adverse impact

Anyone can apply. The question is whether the visa will be granted. Probably not because by filing the I-130 on their behalf you have shown that...

What happens to the H1B transfer if the original petition is revoked before the new employer's petition gets revoked?

More information is needed to answer try question. I suggest you consult with an experienced immigration attorney. You want to make sure you do not...

How long does n600 process takes? The uscis website is not updated

This time of year coupled with the recent events in the USA may have lead to some delays. The date published are only estimates anyway. In addition...

What documents do I have to carry for the same? What are the best options here including immigration/stamping/POE, jobs ?

Stamping for what? Any violation of the law is considered a violation of the terms of a visa. You may however be eligible for the Petty Offense...

Can GC holder have a reentry permit to be out side the US and enter the US at the same time each 5 months ?

While you may not be exceeding the 6 month cut off there may be a question of whether you are maintaining a residence in the United States. Also,...

Can i travel to the US on my tourist visa, after an l-1 new office (consular processing) application was submitted and received?

You should have no problem traveling since the L visa can be a non immigrant visa or a dual intent visa.