May I petition for my brothers living in india on immigration?

No, you cannot petition for your brother, nor your parents, unless you are a U.S. citizen.

Can a illegal immigrant get custody of a child thats not there family ?

That is a question for the local court.

While my I-130 is pending, can i get a student visa?

You can try, but it would be difficult since the evidence suggests you may intend to immigrate to the U.S.

I was deported twice already . got one re entry case that i served 6 months on, and got banned for 20 yrs. is their hope

You are fine, you just have to wait outside of the U.S. for 10 years before you can be admitted. You will need to show hardship to a spouse or...

I am LPR in US, and my son has student visa. Can i file I-485 for him? What is processing time?

You cannot file an I-485 for another person. Rather, the I-485 is an application that a foreign national files to adjust their status to that of a...

Can I get in trouble If I re-entry the US too soon?

Yes, you may have problems if you cannot prove you have an unabandoned foreign residence.

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What should I do next?

Really you have to show your paperwork to an attorney, this description is just not good enough to give any advice even generally.

What forms are needed to file for parents?

I-130, I-485, I-864, G-325

My ex husband is a U.S. resident. He is married to a US citizen. He has his first time offense and got caught with Marijuana

Arriving aliens have a very low chance of being granted a bond. He needs an immigration lawyer ASAP.

I have a pending daca application. If I marry a us citizen now should I decline my daca application and apply for marriage visa?

The two are not mutually exclusive. It is up to you if you want to give up your chance to get DACA, it may not be around forever.