What existed before the big bang What existed before the big bang?

What all thing are there inside big bang object ?.
We don't have theories that can describe the big bang (or whatever happened) properly so we can't say anything definite about the big bang itself, let alone if/what was before it.  We would need (at a minimum) something like a quantum field theory for gravity and we don't have one yet.  We've no reason to think that's all we'd need.

It's not even possible (as I understand it) to define "before" the big bang.  Time, in essence, started at the big bang.  It has no common sense meaning beyond that.