A sister is a mother, a friend and an enemy as well | Aaj Ka Vichaar

On the occassion of Bhai Dooj, GuruJi Pawan Sinha tells how a sister plays many different role in her brother's life. She can treat you like a mother, a friend, spometimes an enemy and many times takes care of you like a guard. 
Bhai Dooj, also called Bhau-Beej, Bhai Tika or Bhai Phonta is a day that celebrates love between brother and sister, just like Raksha Bandhan. It is celebrated two days after Diwali.