What would you do- switched a birth


I'm watching switched at birth and I can't help but wonder, what would real people do if this happened?

What would you do if you found out when your child was, let's say.. 10, they were switched? Would you want your real child back?

Would it be different if they were 2 or 3?

What if the child didn't want you in their life? Let's say you are a happy household and they grew up with one parent, or something to make them hate you because they didn't get the life they were supposed to have?