Tengku Muhammad Shawal bin Tengku Abdul Aziz is the descendant of Sultan Hussein Shah, the 17th Sultan of Johor and the current Head of House of Singapore.
He was married at Istana Kampong Glam, Singapore on 1 November 1991 to Cik Saadah binti Haji Othman. He has a son, Tengku Bahrullah bin Tengku Mohamad, and a daughter, Tengku Zakiyah binti Tengku Mohamad.