Passionate Revenge (1997)

Mia is the daughter of Jorge Benavides, a powerful man who commits suicide because of Ernesto Zamorano, his enemy who tricked him. In order to revenge the death of her father, she does everything she can to get close to this man and destroy him. She makes him think she's his daughter and by his request, agrees to get pregnant and give him the baby as his grandson. Her condition was that she'd live in his house. There she meets the rest of the family member and falls in love with Ernesto Zamorano's son - Juan Pablo, who immediately falls for her. They'll have to overcome many difficulties until they can be happy together.