Who was the grandson of shah jahan?

The grandson of Shah Jahan was Muhammad Azam Shah. He was the son of Shah Jahan's son, Dara Shikoh, and served briefly as the Mughal Emperor in 1707 after the death of his grandfather. Azam Shah's reign was short-lived, as he was defeated by his half-brother, Bahadur Shah I, in a power struggle for the throne.