It's all about loving your parents.

Years after his father disowns his adopted brother for marrying a woman of lower social standing, a young man goes on a mission to reunite his family.
Kabhi Khushi Kabhie Gham keeps every mind human — it fights its subject at zero distance. The story fights on E8/E9 of the E0–E14 reality ladder.
Films fighting at the same level of reality, about the same things.
The same preoccupations examined at another scale — one mind versus a nation.