Trinity

Anyone want to give a suggestion on how to explain the trinity to a 4 year old brilliant child? Yesterday we were singing in the car - God is number 1, God is number 1.... from our church kids' CD.

Ally: I thought that Jesus was number 1.
Mom: ummmmm (thinking about my next step carefully) I don't think I ended up responding.

Next morning - same song.
Ally: God is number 1 and Jesus is number 2.
Mom: God and Jesus are equally important and are both 1.
Ally: ohhh (sounding perplexed)

I think her and I thought deeply about how to respond. Wait til she gets out the Holy Spirit - what will I do next.