M2 (Dependent of student) visa application documents

Passport
One photograph
Original DS-156, nonimmigrant visa application form.
Original DS-157, supplemental nonimmigrant visa application form.
Original DS-158.
Visa Fees
Application fee and service charge to be paid in advance at participating HDFC bank before taking an appointment.
Visa fee receipt issued by HDFC bank with two bar code stickers to be carried to the consulate at the time of interview.
Interview appointment letter.
Sample

Photocopies of the first page, address page and last page of your current Passport.
Both pages of the bar-coded, original SEVIS generated Form I-20 (Certificate of Eligibility for Nonimmigrant Student Status) obtained from a U.S. college, school or university and signed by the primary applicant and a school official. I-20 form must have names of the the primary applicant and all dependents printed on it.

All students, as well as their spouse and dependent children (everyone that is applying for the U.S. visa) must be registered in SEVIS. Your school is responsible for entering your information for the Form I-20 into SEVIS.
Copy of Form I-20, approved and signed by the University authority.
Proof of payment of SEVIS Fee Receipt I-901, if applicable.
A copy of the Form I-20 of the Principal Applicant.
Photocopy of the Principal Applicant's valid visa (if applying separately).
Original marriage certificate for spouse along with entire wedding photo album.
Make sure that the groom and the bride are easily identified in the photographs. It is important to have the specific photographs showing important parts of the marriage ceremony. e.g., for Hindu marriage, putting sindoor in bride's "maang", putting "mangalsutra" around bride's neck, rounds around the fire etc.
Wedding invitation card.
Original birth certificate for each child.
Photocopies of the first page, address page and last page of your current passport.
Additional financial resources to support the dependants during the primary applicant's entire course of study.
If applying separately, a good quality photocopy or the original of the primary applicant's passport - all 36 pages. The copy should be of GOOD quality and the photo must be clearly identifiable.