ISB ~ Luke 8 v21

my brethren:Not Mary’s children, but probably the cousins of Jesus (CCC 500).See note on Mt 12:46. hear the word of God and do it: Jesus’ spiritual family shares his life and follows his ways (6:35; 11:28; Jn 1:12; Rom 8:29). Mary’s divine motherhood was established on this same basis; she embraced God’s will throughout her life. See note on Lk 1:38.