Hello. I would be glad to try and help you understand one thing that I've learned about the God(s) of Mormonism. It's something that I learned from many talks with the missionaries who came to my house. I learned that they believe that Jesus is God like we believe. But they believe that since Jesus is Jehovah (YHWH), the "God of the Old Testament", then Jehovah must have a father. But there's a major problem with this belief.
First of all, we know that Jehovah is the only God that exists (see Isaiah 43 & 44). Secondly, we know that Jehovah is the Father of Jesus because Jesus sits at His right hand (see Psalm 110:1 cf. Matthew 22:41-45). Thirdly, we know that Jesus is also Jehovah (see John 1:1, John 8:58 cf. Exodus 3:14).
Remember, there's one important key to this...
Anytime in the Old Testament when you see "the LORD" with all capital letters, the original Hebrew is "YHWH" (Jehovah).
I'll be praying for you, your best friend, and for the missionaries.
There is one God, not three. His Name is "YHWH". He is the Father, the Son, and the Holy Spirit.
blessings,
matt