That’s his father, current king.
https://duckduckgo.com/?q=Mohammed+bin+Salman&t=ffcm&ia=images&iax=images
https://duckduckgo.com/?q=Prince+Ahmed+bin+Abdelaziz&t=ffcm&iax=images&ia=images
I think that’s Amhed, brother of King Salman and the Uncle to the Crown Prince Mohamed bin Salman.