Dont worry , there was a time , when they all used to sing ....
Saray Jahan se acha Hindustan hamaRa .....
which was written by Allam Iqbal , national poet of Pakistan ....
its all bloody give and take me mate :)
Correction-We didnt use to sing, we still sing sare Jahan se accha hindostaan hamara. Its sung like national song here in India. We love this song.
And language isnt property of any country or race. Language doesnt know boundries. Urdu is as much an Indian language as any other.
Peace