80e

It will not matter that in whose name is taken,only the thing which matter is that who is paying int on such loan.As per language of sec 80E focuses that ded will be given to the person making payt of such int and in case of joint bank a/c the first holder will be deemed as payer and will get ded.Moreover,in your case it doesn't matter that among father&assess who is payer,because father or assess whoever deemed as payer are eligible for deduc.