The text of today forms the second part of the “sandwich” construction that Mark has used here. He introduced the family of Jesus in 3,20-21, interrupted this with the text on the Beelzebul controversy (3,22-30) and returns to the family of Jesus is today’s text 3,31-35. By using such a structure, Mark indicates that the family of Jesus are also hostile to Jesus. Also, Mark places them “outside” while Jesus is “inside” the house. This too indicates that they are not disciples. Jesus then defines family in terms of those who do the will of God. Some also think that by not mentioning the father of Jesus, Mark wants to assert that for Jesus and his disciples, only God is Father.
We may imagine that because we have been baptised are bear the name Christian we are automatically counted as members of Jesus’ family. However, baptism alone will not make us members of Jesus’ family, but the living out of the baptismal promises in our lives. This means that we must each do what we are called to do, namely our best at every given moment.