God

God is the only creator and ruler of the universe. "Thou shalt have no other gods before me."---Exodus 20:3 

God the Father
God is the father of all living, and non-living, things. He created the Earth, sun, moon, planets, stars, humans, animals and everything in the universe in 6 days. He is a just God, and can do no wrong. Some people ask why a just God would send people to Hell. The answer is that any "just" being would send people to Hell if they were sinners. We all have obviously sinned, so how can anyone get to Heaven?

God the Son
God knew it would be a problem for anyone to get to Heaven if they didn't have some sort of passport. Jesus is that passport. God sent his only son, Jesus, to pay for our sins. You see, the only way we could get to Heaven is if a perfect person suffered the torment for us. Jesus got nailed to a cross and died. But the good news is the Jesus rose from the grave and conquored sin! So now if we beleive in Jesus, we can go to Heaven for eternity!

God the Holy Spirit
The Holy spirit is the spirit that allows us to do good and to beleive in Jesus. Not much to say.