Then tell me is that anything wrong that if any family being part of the forum.
There's nothing wrong about that I presume. What's wrong is why you've used your father's address if you knew that it will cause you trouble? That is the fishy part of your story.
Just like what you said in here
Is he think I am that much fool to use multiple accounts with same addy which is against in every campaign's general policies and not recommended in forum?
You've said that you're not a fool to use multiple accounts with the same address but you have done it already. I though your wise enough.
I don't really care and know what evidence can you provide to prove that it is really your father's account. But an evidence is a must in cases like this.
Also, the blackmailer will also receive enough consequences I guess. Maybe a Red tag.