Rani,
Just to avoid queries better to open up a seperate account under your name and transfer the money from joint account to your new account. Even if they asked from where the money come from, you can tell them that you have been saving your money in an joing account, for this immigration purpose you have transfered it to your own account. Or you can tell them that your father inherited to you.
Don't try to include someone who's not in your application (queries may raise).
Regards,