We see here the simplicity of Jesus’ words. If you love and obey Him you are His brother and sister. The LDS Church teaches that their heavenly Father and heavenly Mother created all of us (Jesus and Lucifer included) by a sexual union; thereby making everyone literal brothers and sisters.
This demeans and degrades Jesus’ true position as it places Him into the common category of being a created being just like you and me. When we do this to the Lord it dulls our senses and disables our ability to truly worship Him as He deserves. See the article on Jesus, My Brother here
“Thus it is shown that prior to the placing of man upon the earth, how long before we do not know, Christ and Satan, together with the hosts of the spirit-children of God, existed as intelligent individuals, possessing power and opportunity to choose the course they would pursue and the leaders whom they would follow and obey. In that great concourse of spirit-intelligences, the Father’s plan, whereby His children would be advanced to their second estate, was submitted and doubtless discussed. The opportunity so placed within the reach of the spirits who were to be privileged to take bodies upon the earth was so transcendently glorious that those heavenly multitudes burst forth into song and shouted for joy.” James E. Talmage, Jesus the Christ, pg. 8.