Is it possible for a Hindu boy and a Christian girl to get married under the Indian Christian Marriage Act? Will they need to convert to Christianity or can they practice their own religions after marriage?

Yes, your father is at risk of arrest as he is liable for the bond amount if your brother fails to appear in court. You must immediately contact a lawyer and inform the court about the situation. Explain your brother’s reasons for non-appearance and work with the lawyer to ensure your father is not held liable for the bond.