What your parents want is job security and a better life for you. If they got these things in other streams, then their would have been no problem. You can try asking them for commerce stream. Indian parents consider it second choice because it has scopes and many jobs. They can (though the probability is very low) agree on arts too if you give them a proper plan about how are you going to earn through it.
Basically what your parents want is a secure future for you. You can try convincing them regarding this.
Hope this helps.