The brother-sister bond is a special one. The Hindus celebrate this in a special way on 2 occasions : Raksha Bandhan, and Bhai Dooj.
Bhai Dooj comes 2 days after Diwali. Here, the brother goes to the sister's home. The sister prepares a sumptuous meal for her brother. In return, the brother gives her some gift, and promises her his protection.
Isn't this special ? A bond gets further strengthened through a formal occasion.
Brother-sister bond is more special in India than in other countries. Because of the celebration of these 2 festivals. It is deeply ingrained in Indian culture. This bond glues human relationships in a more warm, and caring manner.
In case you are at some distance to your sister and can't meet her, do send her a special message of your love, and care.
Happy Bhai Dooj (21 Oct, 2017) !