My prediction (again..
I think that his dad would come to India and ask Prince to return to London. By this time, Prince may have fallen in love with Rani. Anyway, his dad may pressurize him into returning and may even speak against the Goyals. This may anger Prince and he'd leave the house and renounce his dad's riches. He'd start living with the Goyals, who'd later decide to get him married to Rani..