A “person” is not a spirit and is not God. Persons have frailties, while God does not.
You’re using the term “person” to mean “human being”. “Person” is a technical term of art in philosophy and theology. It is not synonymous with “human being”. The definition of “person” requires rationality (a rock is not a person) but says nothing about “frailty”.
But we are three persons ourselves....Triune beings.....Body Soul and Spirit....so it is not difficult to grasp God as 3 persons of the Godhead.
Additionally.........I am a women....a mother....and once a wife......three defined differences yet one ‘person’.
Just as God is in the Trinity yet one.