I think my dad is a pedophile
What makes you think your dad is a pedophile?
He doesn't seem interested in females, he only talks to my mom and me and my brothers.
If you have some concrete evidence that your dad has pedophile inclinations, you should report him. If you don't have any reason to think that except that he doesn't seem overly interested in females, then you should not accuse him; that is not real proof. Be careful throwing around accusations that could harm others' reputations.
I just like saying it.
Making an accusation like that is pretty severe. If you have no evidence or it's something you really don't believe it's true I would recommend not spreading this information.