Banks typically give a joint loan to multiple borrowers only if they all belong to the same family. The most common case is to pool together the incomes of a husband and wife to get a larger loan amount. Some banks also do allow parents and children to be joint borrowers on a loan.

However having friends as joint borrowers is not something that most banks allow. It's generally understood that this is because friendships can sometimes run into issues. The same maybe argued for family relationships, but they are generally considered stronger.

Most public sector banks explicitly state that spouses or family members can be joint borrowers on loans. You may consider private sector banks such as Kotak Mahindra or ING Vysya Bank to see if they would allow your application.

Regards,
Ram