What is the Meaning of Hebrews 2:11 - he that sanctifieth and they who are sanctified are all of one Hebrews 2:11 (KJV)
  For both he that sanctifieth and they who are sanctified are all of one: for which cause he is not ashamed to call them brethren,


It is very confusing to read "he that sanctifieth and they who are sanctified are all of one".
What is the meaning of this verse?
It means Jesus and Christians are on the same team.  It might make a little more sense in the NIV:


  Both the one who makes people holy and those who are made holy are of the same family. So Jesus is not ashamed to call them brothers and sisters.


The rest of that section of Hebrews is talking about how Jesus is like us, in His humanity, which allows us to be part of the same "family."