I was told by a Mormon that the Father became the Son and that Mormons will be married for eternity.

I can't find any verses in Scripture the Son use to be the Father or that the Son was praying to Himself.

I also can't find where it says in the Bible were we are married for eternity.

"For in the resurrection they neither marry, nor are given in marriage, but are as the angels of God in heaven" (Matt. 22.30).