Hi Rinnie, just a few things, if you don’t mind. Actually, it is a matter of fundamental Christian faith that God is exactly One nature in three distinct Persons. It may seem trivial, but words have great import and great potential to mislead- Especially when it comes to the Blessed Trinity. The Church’s explicit faith in the Creeds of the Church is that God is One essence/nature/being in 3 distinct Persons. To speak of three natures is actually to speak of 3 Gods. The difference is this: nature is what you are (A human being, a combination of a human body and a rational Soul), But Person is who you are (Rinnie, A Subject). What God is, is exactly one thing (Divinity)- Who he is, is Three distinct Persons- Three Divine Persons in One Nature. This has been so Forever and is absolutely independent of creation. It’s God’s inner nature- who he is in himself, beyond any relationship he has with any creature at all.
I think here you are no longer talking about the Blessed Trinity (God as he is in himself from all eternity) but rather the Hypostatic Union/incarnation of God. Only One person of the Trinity (God the Son) entered the temporal, created world and took on a human nature from Mary (But not a human person). So that in Jesus, there is One Divine Person- God the Son/God the Word, possessing at once two different natures:
One:- The Divine nature that the Son has from Eternity with the Father and the Holy Spirit.
The Other:- A complete human nature that he took from Mary with an infused Human Soul.
This exists in Jesus without any inter-mingling, co-mingling, or mixing of the two natures in any way whatsoever. It just means that Jesus is One Divine Person who has two ways of existing and acting. I always say this (I got it from Philip St. Romain)- Jesus has two ways of speaking about himself- He can say “I” the way you say “I ate this, did this, I like this etc”- But with him, he can say "I" and mean the Divine being, and he can say "I" and mean the human nature- Each time he will be speaking the absolute truth even though he may say very different and contradicting things
Eg.
He can say I know all things (It will be 100% true- God knows everything)
He can say* I* don’t know this/that (It will be 100% true- His Human nature has limited knowledge)
Both times though, it is God who is speaking, because the “I” in both refers to a Divine Person, not a human person as there exists no Human person in him (Remember, he took Human nature but not a human person- There is only One person with two natures in Christ). Hence why Christians can say shocking things like: God died, God was born, Jesus is God etc
But All this in no way refers to God the Father or God the Holy Spirit- Only God the Son has taken on human nature. God the Father and God the Holy Spirit have never been born, eaten, suffered, died, resurrected, ascended- Ever. Only God the Son. So it may not be completely accurate to say that Three natures are God and include there the Hypo-static union etc.