When His parents [finally] saw Him, they were very surprised and His mother asked Him, “Son, why have you treated us this way? Look, your [step-] father and I have been anxiously searching for you.”
And when Jesus heard this, He was amazed and said to those who were following [along], “It is true when I tell to you, I have never found [anyone with] such great faith, not [even] among the Israelites.
While Jesus was still speaking to the large crowds, His mother and [half-] brothers were standing outside [of the large house. See 13:1] wanting to speak to Him.