What brought tears in Salman Khan's eyes?

When the whole world was celebrating Salman Khan's sister Arpita Khan's wedding, in one corner was Salman Khan wiping away tears from the corner of his eyes. But when there were celebrations galore at the Falaknuma palace, what brought tears in his eyes? Afterall his sister was marrying the man of her choice whom the entire family had blessed. Actually Salman Khan is very close to his youngest sister Arpita Khan. Actually she is more like his daughter. Arpita is more than 20 years younger to Salman Khan. Salman Khan has actually seen her grow like a child into a beautiful young lady. SHe is the darling daughter of the house. Everyone loves her and pampers her. Salman has played a vital role in taking all major decisions of her life. In fact when Arpita chose Ayush as her life partner, she discussed it with Salman. It was very important for her to take his consent. She just said once the venue of her choice and brother moved ahead and booked the entire Falaknuma Palace. The brother further gifted her a 16 crore flat. So when the brother is so doting, one can well imagine the degree of attachment.