Is it still possible for someone who overstayed their visa to acquire legal status?

Yes, it is possible to do that but only if the original CPR is terminated. See Matter of Stockwell, BIA

When can i change my jobs?

Assuming your contract is binding you should wait until May to leave.

Should I mention my step-son, 15 years old U.S. citizen in Form I-485 and Form I-130? I'm apply for green card through marriage.

Of course you should. You must give all information which is relevant.

I went to the US in 2002 on F-1 Visa. Dropped out of school in Fall 2004. Overstayed till Sept 2007. Visa expired Dec 2006.?

You can certainly apply but you will not receive a visitor’s visa. You violated the terms of what appears to be the the only nonimmigrant you have...

Yes you can do that but there are some timing issues to watch out for.

My child has been abducted by his mother?

You should file a complaint with the police and also notify the US consulate. I assume they have the equivalent of private detectives in India so...

Do I have any chance of getting US passport while were absent for more than 1 year (breach of continuous residency requirement)?

First you must apply for naturalization not a passport. Second, you must be in the US for four years and a day following an absence of more than 12...

If the consulate knows your mother wants to help with your baby, they will deny the visa. Further, they will deny it anyway unless she convinces...

Applying for Green card through marriage while waiting for OPT

The marriage case has no impact on the F-1 OPT and vice versa. However, the OPT can only be used for work which requires your degree and the EAD...

Can I sponsor my husband for visa?

You should be fine with your 2018 tax return, current employment from your employer, current pay stubs and a letter explaining the four months out...