The Big Bang Theoryproved that shows about fun-loving, nerdy friends could be a major success.
The show wrapped its 12-season run in mid-2019, perIMDb.
A fan noticed an interesting detail involving Raj’s family
Priya Koothrappali was Raj’s sister.

Played by actress Aarti Mann, she appeared on 12 episodes (viaIMDb).
Their relationship ends with Priya heading back to India.
Another fan pointed out a piece of evidence that might support the theory.

A scene from another episode shows awedding photoon Raj’s fridge.
“There may be a photo of Priya’s wedding on Raj’s fridge,” the fan noted.