Ooty Varai Uravu (1967)

Ravi, the only son of Vedachalam (Baliah), has traveled on business. Returning home, he meets a young woman on the train after picking up her spilled luggage. The contents of the luggage reveal that she is his sister, from his father's teenage years. When he returns home, she is moved in and living a life of wealthy luxury. But is she really who she says she is?