In my another post ("Have you done a poo?" vs. "Did you poo?") I said
Pretend that I have a 10 year old son.
Is it idiomatic? Does that sound natural? Is it an appropriate beginning for discussion?
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"Pretend" means to behave in a way that makes something contrary to reality seem real. Children "pretend" when they are role-playing, and they act out imaginary situations.
If you are presenting a hypothetical scenario for someone to consider, it would be more idiomatic to say:
Imagine that I have a 10-year-old son
Let's say that I have a 10-year-old son.