Back to the topic, sorry guys.
There is NO way to tell a kid he or she is adopted, the secret is never let it be a secret.
That way no embarassing questions pop up, no mental trama. I never had to ask is I was adopted, I never rember being told I was adopted, but I always new I was adopted, it was always out in the open with my family, so it became a non-issue.
A friend of my uncle's found out he was adopted when he was 40, he freaked out.
As for biological parents right to know "thier" child. It's NOT your child anymore, you gave him or her up, for whatever reason, be the good reasons or bad, it's up the child to reach out to you, maybe they don't want to know you.
I know adoptions lawas in ontario are a real bitch, it has to be a 2 way street, I'm curious to know where I came from, scared to find out.