In light of the errant Strange Fire Gospel, it seemed appropriate to dust off this gem from John Piper on Mk 3.20-35:
The crowd came together again, so that they could not even eat. And when his family heard it, they went out to seize him, for people were saying, "He is beside himself." And the scribes who came down from Jerusalem said, "He is possessed by Beelzebul, and by the prince of demons he casts out the demons." And he called them to him, and said to them in parables, "How can Satan cast out Satan? If a kingdom is divided against itself, that kingdom cannot stand. And if a house is divided against itself, that house will not be able to stand. And if Satan has risen up against himself and is divided, he cannot stand, but is coming to an end. But no one can enter a strong man's house and plunder his goods, unless he first binds the strong man; then indeed he may plunder his house.
"Truly, I say to you, all sins will be forgiven the sons of men, and whatever blasphemies they utter; but whoever blasphemes against the Holy Spirit never has forgiveness, but is guilty of an eternal sin"—for they had said, "He has an unclean spirit."
And his mother and his brothers came; and standing outside they sent to him and called him. And a crowd was sitting about him; and they said to him, "Your mother and your brothers are outside, asking for you." And he replied, "Who are my mother and my brothers?" And looking around on those who sat about him, he said, "Here are my mother and my brothers! Whoever does the will of God is my brother, and sister, and mother."