Elder Joseph F. Merrill, Conference Report, April 1949, First Day-Morning Session, p.27;

“Now there is another personality of which I desire to speak, one that the world calls by a name, but in whose reality as a personal Being it does not believe and that person is Satan, the Devil. But according to our understanding and teaching. Satan is a person with a spirit body, in form like that of all other men. He is a spirit brother of ours and of our Lord Jesus Christ, who is our Elder Brother in the spirit world.”

Matthew 16:23; “But he turned, and said unto Peter, Get thee behind me, Satan: thou art an offence unto me: for thou savourest not the things that be of God, but those that be of men.”

As it was offensive to Jesus for Peter to say Jesus didn’t need to die – it is extremely offensive to Christians, not to mention Jesus that Satan is our brother.  Lord have mercy on their souls.