Willa Holland as Thea and Stephen Amell as Oliver in The CW series 'Arrow'.Facebook/Arrow

India is celebrating Raksha Bandhan on Saturday, 29 August. It is observed to celebrate the brother-sister relationship.

On this special occasion, we bring you a list of popular on-screen siblings who are known for their deep bond:

Oliver and Thea: The billionaire playboy-turned-hooded vigilante and his sister play a vital role in The CW supernatural series "Arrow". The characters are portrayed by Stephen Amell and Willa Holland. They are currently gearing up to take centre stage in Season 4 of the show.

Haley, Alex and Luke: The three children of Phil and Claire Dunphy from ABC sitcom "Modern Family" have been loved by the fans ever since the comedy series premiered on 23 September, 2009. The characters are portrayed by Sarah Hyland, Ariel Winter and Nolan Gould.

Professor Sam Keating and Dr Hannah Keating: The on-screen sibling from Shonda Rhimes' hit series "How to Get Away with Murder" did not have a major role to play in the first season. But, they are expected to have a strong presence in the second season, which is scheduled to air on Thursday, 24 September, at 10 pm. Professor Sam and Dr Hannah are portrayed by Tom Verica and Marcia Gay Harden.

Zachary aka Zach and Grace: The teenage children of Peter Florrick and Alicia Florrick from the critically acclaimed CBS drama, "The Good Wife", have nothing common between each other. While Zachary aka Zach is a self obsessed boy with an interest in politics, Grace is known for her friendly nature. The characters are played by Graham Phillips and Makenzie Vega.

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