Shah Jahan
Shahab-ud-din Muhammad Khurram (5 January 1592 – 22 January 1666), better known by his regnal name Shah Jahan (Persian: ; "King of the World"), was the fifth Mughal emperor, who reigned from 1628 to 1658.
His reign represented the height of the Mughal architecture, most notably the Taj Mahal.
His relationship with his wife Mumtaz Mahal has been heavily adapted into Indian art, literature, and cinema.
Shah Jahan was widely considered the most competent of Emperor Jahangir's four sons and after Jahangir's death in late 1627, when a war of succession ensued, Shah Jahan emerged victorious.
He put to death all of his rivals for the throne and crowned himself emperor in January 1628 in Agra under the regnal title "Shah Jahan" (which was originally given to him as a princely title).
Although an able military commander, Shah Jahan is perhaps best remembered for his architectural achievements.
The period of his reign is widely considered the golden age of Mughal architecture.
Shah Jahan commissioned many monuments, the best known of which is the Taj Mahal in Agra, which entombs his wife Mumtaz Mahal.
In September 1657, Shah Jahan fell seriously ill.
This set off a war of succession among his four sons in which his third son, Aurangzeb, emerged victorious.
Shah Jahan recovered from his illness, but Aurangzeb put his father under house arrest in Agra Fort from July 1658 until his death in January 1666.
On 31 July 1658, Aurangzeb crowned himself emperor under the title "Alamgir".
The Mughal Empire reached the pinnacle of its glory during Shah Jahan's reign and he is widely considered to be one of the greatest Mughal emperors.
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Dara Shikoh
Dara Shikoh, also known as Dara Shukoh ,
(20 March 1615 – 30 August 1659) was the eldest son and heir-apparent of the Mughal emperor Shah Jahan.
Dara was designated with the title "Padshahzada-i-Buzurg MartabaPrince of High Rank") and was favoured as a successor by his father and his older sister, Princess Jahanara Begum.
In the war of succession which ensued after Shah Jahan's illness in 1657, Dara was defeated by his younger brother Prince Muhiuddin (later, the Emperor Aurangzeb).
He was executed in 1659 on Aurangzeb's orders in a bitter struggle for the imperial throne.
Dara was a liberal-minded unorthodox Muslim as opposed to the orthodox Aurangzeb.
A great patron of the arts, he was also more inclined towards philosophy and mysticism rather than military pursuits.
The course of the history of the Indian subcontinent, had Dara Shikoh prevailed over Aurangzeb, has been a matter of some conjecture among historians.

Question: Who is the paternal grandfather of Dara Shikoh?
Answer: Jahangir