His brethren and His mother: i.e. the kinsfolk of Mark 3:21.
and. Note the Figure of speech Polysyndeton (App-6), in verses: Mark 3:31-35.
without. That they might more easily seize Him (Mark 3:21).
Related Commentaries of Mark 3:31
Mark 3:31
31 There came then his brethren and his mother, and, standing without, sent unto him, calling him.