How to say in Czech: Who is this child?

English
Who is this
Czech
Kdo je tohle dítě?
This is not my child.
What is this child doing here?
Whose child is this?
Why is this child here?
Do you know this child?
Does anybody know this child?
He is just a child.
Are you an only child?
I am a child.
You are not a child anymore.

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