Dr Kumar Vishwas
Why do brother-sister bonds matter, and how do I keep them strong?
Sibling bond carries the parents' well-being
When a sister ties rakhi on Rakhi or Bhai Dooj, she is seeking her parents' well-being in her brother. The first relationship anyone has on earth is with those born of the same womb.
She looks in that brother for the well-being of her parents; she knows that if her brother is well, her parents' old age will pass well.