Mark 6

As the Savior returned back home, we read -

"...when the sabbath day was come, he began to teach in the synagogue: and many hearing him were astonished, saying, From whence hath this man these things? and what wisdom is this which is given unto him, that even such mighty works are wrought by his hands?
3 Is not this the carpenter, the son of Mary, the brother of James, and Joses, and of Juda, and Simon? and are not his sisters here with us? And they were offended at him."  (New Testament | Mark 6:2 - 3)

The Savior then taught -

"...A prophet is not without honour, but in his own country, and among his own kin, and in his own house."  (New Testament | Mark 6:4)

Obviously then it is hard for many to sustain individuals that we know.  It is much easier to believe in those that we don't.

It is in this same verse that we learn that the Savior had at least seven (step) siblings.  I understand that the plural word "sisters" in Greek means three or more.

But I think what doctrine is of greater importance is when we read -

"And he could there do no mighty work, save that he laid his hands upon a few sick folk, and healed them."  (New Testament | Mark 6:5)

Why?  Moroni taught -

"For if there be no faith among the children of men God can do no miracle among them..."  (Book of Mormon | Ether 12:12)

This applies to both spiritual and physical healings and miracles.