Hi Man_Utd bro,

It is not easy to save 40-50 K in US with 2 kids and a wife. That's why I'm suggesting you the best way without spending a dime. I'm not sure what kind of Work experience you have. You can post your resume through job hunting sites like indeed. com, monster.com,  hotjobs.com etc. If nothing works, finally find desi consulting companies through Dice.com ( or you can get to know lots of them through sajha friends too!). Then try to get H1-B visa ( or change your current visa to H1-B visa), so that your spouse and both your kids ( I'm aware that one of your kids is US Citizen) can come to US legally. After that you can file green card through your employer through EB-1, EB-2 or EB-3 depending on your work experience and degree.
So, your first step would be to find a Company willing to sponsor you (you don't pay a dime; in fact some companies might pay your relocation expenses). Then find  a good lawyer ( he does not have to be extra-ordinary since most of  the processing time depends upon US DOL (Department of Labor) and USCIS (United States Citizenship and Immigration Services).
I hope this solve your problem if you are writing this seriously. Even if you are just playing since you are high or drunk, I don't mind since I think this will at least help other people in your situations. And moreover, its Friday!
You have a very nice weekend!