Mosiah 15:3

the Father, because he was conceived by the power of God; and the Son, because of the flesh; thus becoming the Father and Son:

He is the Father because God’s power created him. He is the Son because he has a human body. So he is both Father and Son.

“He’s the Father because he was conceived by God’s power. He’s the Son because he took on flesh. In this way, he becomes Father and Son—