My brothers don't know I'm their sister

Rosario is ruthless, cold mafia boss. He has six sons who are capable of the same cruelty and violence. They all have only one weakness and it's family.

So when Rosario learns that he has 14-years old daughter he experiences shock. After discussion with her mother he decides to take Silvia for family holidays. He also decides not to tell Silvia for now that he's her father.

The question is: how will the truth be revealed? Who will find out about the secret first? Silvia or her brothers?