Who gave birth?

Once it was a discussion about creator - God.

when I was small I asked my father " Pappa do you think god created us?"

"yes" He said

" Then prove me" I asked him in rocket speed.

Pointing his finger toward plant he asked " How does it grow?"

I said " By pouring water and from sunlight and it uses carbon di oxide too"

" Ofcourse but Plants starts it journey being a seed, right"

" yes "

" Then tell me from where do you get seed"

" from trees or plants"

" then which is first - seed or tree"

" Seed, tree - tree, seed" I was confused.

" See this is gods power, there is somewhere some power which is unseen and unknown, can you tell me from where this earth sun moon and all came, this is all gods creation, he is the master of all universe"

"This means god created whole universe and including us"

"Yes my son"

I felt happy and I started thinking myself that atleast I must be th first human to see god.

I went with father for a walk and while coming back one question struck my mind "

Pappa I understood everything except one thing"

"oh is it, what is the troubling you my son"

My father sat on stone bench in a garden and I sat on his ties.

" Pappa who gave birth to god?"

My father sat without answer, and till today I havenot got answer - I am still searching, If anybody knows he is the not a human being.