You usually do have to bring some form of ID when you pick up your badge...
I bring my Oregon state ID (I got it at the DMV, it's not a license) and it's easier to carry around with me.
Although, if you have a passport, driver's license or student ID it could pass at registration.
If you don't have either of these forms of ID, your dad's should be sufficient since he's your legal guardian.
If you want to be extra sure, you should e-mail staff and ask them about it here: registration@kumoricon.org.