John Gill Commentary Mark 3:31

"And there come his mother and his brethren; and, standing without, they sent unto him, calling him." — Mark 3:31 (ASV)

There came then his brethren and his mother
At the same time he was speaking to the Scribes, who seem to be different persons from his friends and kinsmen, (Mark 3:21) ,

and standing without ;
for Christ was within, in the house, talking with the Scribes and Pharisees, and preaching to the people; and the crowd being so great, that they could not get into the house; they

sent unto him, calling him :
they not only sent one in to let him know who they were, and that they were without doors, desirous to speak with him; but also, with a voice as loud as they could, called to him themselves; (See Gill on Matthew 12:46).