That depends upon how long they want to visit. If they are coming for a week, they don't have to be sponsored. If they have passports they can come as tourists. Almost anyone can come to visit the US (certain types of criminal records make people ineligible even to visit). It's only the people who plan to stay for long periods of time who need special permission.
No, howver if you are Citizen you may sponsor a parent
If you mean can you adjust his status to become legal- NO. This is only if you are a U.S. citizen.
I got married with my husband in December last year. He is planning to apply bankruptcy in Jan. Does bankruptcy effect my green card application? (by the way he got his green card in 2010)
The green card holder can petition for his/her spouse and unmarried children only.The preference is only for them. The time taken for process completion that is the waiting time for green card holder spouses and for minor children is four years while the period is eight years for adult children age 21 or over. Relationship to the green card holder only matters for petitioning using Form I-130 not the applicant's home country.He/she can be definitely an Indian.
How much for a green sponsor
Your children will have American citizenship but children cannot sponsor their parents in the US until they are 18 years old.
NO.
That depends on the motives of the green card holder ;)
The only time a green card holder is forgiven for working illegally or owing taxes is if they obtain the green card through marriage to a US citizen.
Not necessary since the child is a US citizen by birth. Before the child is 18 years of age you need to apply for US citizenship certificate using immigration Form N-600. If the question is referring to the PARENT of the US-born child getting a green card, then there is no special way to do this: you will have to wait until your child is 21, after which they can then sponsor you for a green card. Merely being the parent of a US Citizen does not automatically entitle one to a green card immediately (or automatically).
You can marry the green card holder but that does not affect your ability to work. Your right to work is completely tied to your OPT and then your H1B. If there is no gap between the end of your OPT and start of H1B then you can carry on working. If your OPT ends then you have to stop working and can not start work again until you have your H1B. Your marriage to a green card holder is irrelevant - you must have your own visa to stay in the USA.
No. Your sponsor must already be a U.S. resident so you, as a non-resident, cannot sponsor yourself. Think if you have any relatives, friends, or employers who you can ask to sponsor you!