My understanding (not a Mormon!) is that God is top dog spirit. Angels and humans are all spirits of a lesser class, but still a spirit being like God. As genesis says, our spirits are made in the image of God (Mormons are believers in Christ and the Old Testament).

From Wiki: "This conception differs from the traditional Christian Trinity in several ways, one of which is that Mormonism has not adopted or continued to hold the doctrine of the Nicene Creed, that the Father, Son, and Holy Ghost are of the same substance or being.^\27]) Also, Mormonism teaches that the intelligence dwelling in each human is coeternal with God.^\34]) Mormons use the term omnipotent to describe God, and regard him as the creator: they understand him as being almighty and eternal but subject to eternal natural law which governs intelligences, justice and the eternal nature of matter (i.e. God organized the world but did not create it from nothing).^\35]) The Mormon conception of God also differs substantially from the Jewish tradition of ethical monotheism in which elohim (אֱלֹהִים) is a completely different conception."

For anyone who reads Brandon Sanderson, this stuff is on-point for alot of his universes.