Mark 3:34

"And he looked round about on them which sat about him, and said, Behold my mother and my brethren!"

Cross References (ranked by relevance)

For whom he did foreknow, he also did predestinate to be conformed to the image of his Son, that he might be the firstborn among many brethren.

Matthew 28:10

Then said Jesus unto them, Be not afraid: go tell my brethren that they go into Galilee, and there shall they see me.

John 20:17

Jesus saith unto her, Touch me not; for I am not yet ascended to my Father: but go to my brethren, and say unto them, I ascend unto my Father, and your Father; and to my God, and your God.

Psalm 22:22

I will declare thy name unto my brethren: in the midst of the congregation will I praise thee.