Income from house property

My father purchased one home in his name and we all are residing in. Now we purchased second home in the name of my FATHER and my SON, my father invested some money and we took a loan for remaining amount  in the name of my SON who is a GOVT SERVANT and paying EMI for the same. We let out the second house and receives the cheque of rent in the name of my father. I want to know who is the responsible to pay the TAX on the income from propery.