Gladly Lucifer was more OUR brother, than Jesus, even though Jesus is also OUR brother, for we all have the same Heavenly Father, but remember Jesus was the ONLY ONE who was BEGOTTEN of the Heavenly Father!
NOT you, NOT I, and of course NOT Lucifer none of us was begotten of the Heavenly Father, as was Jesus!
Since historic Christianity has no spirit children in heaven doctrine, do you want to explain the exact relationship between Heavenly Father and spirit children in heaven?
Is he begetting spirit children in heaven with a mother god or not?
Aren't you basically saying the only difference in "begetting" is that in heaven, he has a wife-god begetting spirit children [Eliza Snow's hymn sung in LDS stakes] and on earth, LDS essentially believe [without using this language] that Heavenly Father temporarily made Mary into his personal concubine and had a special embodied child?
How can a God of flesh have a child through Mary? The Holy Spirit coming upon Mary as a spiritual being is a supernatural miracle; but a fleshly [super]nature coming upon Mary in a "literal paternity" [LDS general authorities' words] sounds rather crass and I would say is provocative to the true God of heaven.