Bt Dil se I guess Not Somya it's Ishana who is Anika's Sister..
And that Man is not Ishana's real father. Bcuz agar wo real father hota toh apne beti ko aise kam karne majboor nhi karta. On the other hand Ishana ka jyada care nhi karte wo. Mona ko to iss kam me nhi laate.