Khan was attending the nuptials in Bolton, England on Tuesday (25Dec12) as a second cousin of the bride when news of the tragedy filtered through to guests.
Two boys - Adnan Habib, 10, and his brother Arsalaan, four - died along with their aunt after the car they were in overturned on a major highway.
The trio was guests of the groom and not related to Khan, but the sports star was left devastated by the tragedy and he paid his respects at the victims' funeral in High Wycombe, England on Saturday (29Dec12).
In a post on his Twitter.com page, he writes, ""In Wycombe for the funeral of 2 young kids + aunty who died in a car crash on way to a cousins wedding last week. Condolences to the family.""