When Manu comes to see Rajas sister

When Manu and his family come to see Rajas sister, Rajas parents introduce one more girl called 'Sapna' who is their to be daughter in law. And then she is also shown talking to Raja on the terrace when Manu goes to the terrace. If Sapna is supposed to marry Raja, then was Raja two timing Tanu ?? As Tanu has maintained from the beginning that she has a boyfriend, aka Raja.