I am married and have H1B Visa. I have worked in US from 02/09/2007 to 10/13/2007.
My wife and Kid are in India and they do not have dependent visa and never been in US. She does not have any income in India. I am going to file tax return.

What is my marital status for tax purpose?

Since you did NOT end the year in 2007 in the U.S. you CANNOT file jointly with your wife.

You must file a dual-status return, but you CANNOT claim eith your wife or child as dependents because they were NOT in the U.S. at ll in 2007.