Jesus Didn't Drool on Himself or Howl at the Moon

Yet according to Mark 3:21 his family considered him looney. Crazy. Out of his mind. Why? All we can assume is that his expressed beliefs about God God were different than theirs. His loving and miraculous activities cultivate neither family unity nor devotion to the God of Israel. There was no pride in knowing that the eldest son of Mary was preaching the word of God. Jesus was deemed "out of his mind" because the God he revealed in his words and actions did not match the interpretation of the Torah's Yahweh that had been passed on for generations. Perhaps the same thing happened to John the Baptist when instead of falling into the levitical line of his father, he preached a new message in the wilderness. How did Elizabeth and Zachariah feel about his state of mind? How did Jesus feel to find that not even his family could consider him or his message sane?