~”Where in the Bible do you get the notion that we are Lucifer’s sibling? Lucifer was an angel. Angels and humans are not the same.”~
It’s a doctrine that differentiates us from Orthodox Christianity. There are supporting verses in the Bible; but it is largely drawn from what we believe to be modern revelation.
Can you cite those verses for me, please? Again, Lucifer was an angel, we are human. “Largely drawn from what you believe to be modern revelation”. You mean something Joseph Smith said?