According to LDS (Mormon) teaching, what is the relationship between Jesus and Lucifer? What does the LDS/Mormon church teach about the relationship between Jesus and Lucifer? Are they beings on the same level or of the same origin? What are their natures? What texts are used to teach specifically about the relationship between them?
The LDS theological view is that God, the Eternal Father, created all spirits, including Jesus the Firstborn, Lucifer, and all the rest of us, as His spirit children. Further, God is a separate being from Jesus and the Holy Ghost, who are all individual personages.

These three beings constitute the godhead, which is different from the usual Trinity belief.

These teachings are in harmony with at least the following scriptures:


Col. 1:15 (Jesus the Firstborn of every creature, image of the Father)
Isaiah 14:12-14 (Lucifer-son of the morning-rebellion)
D&amp;C 76:25-27 (Lucifer, an angel in the authority of God, fell)
D&amp;C 93:21 (Jesus is the Firstborn)
Moses 4:1-4 (God tells Moses what happened in the pre-mortal life with Lucifer)


For context: there was a council in heaven regarding God's plan for all His spirit children. God's plan was presented, and a Savior was needed to fulfill it. Jesus was Chosen by the Father to fulfill that role.

Satan opposed, declaring his plan, which was contrary to the will of the Father. War ensued between "the dragon" (Satan) and the Christ's followers, which war is still ongoing today, here in mortality. It's a sibling rivalry, if you will, which Jesus and His disciples will win in the end.