Drop box eligibility

[tina]

Hi,
I would like to know, My dad is 62 and my mom is 56 and they r applying for the visitor's visa at Mumbai, can they apply tru drop box together or only my dad is eligible. Also Do they need their marriage certificate at the time of interview along with other documents.can U pls reply. Thanks so much in advance

[immihelp]

Mother can not apply by drop box.

No marriage certificate needed for your parents.