My father is a pedophile

[volicon]

Do I need to change the plackard from Homosexuals to Pedophiles to drive the point across?

I don't think pedophilia is in the same rank with homosexuality, racism and religious oppression. Your race and your sexuality do not infringe upon others' free will. You religion may or may not do so. Pedophilia definitely does.

As to the OP, I think alarming the parent of the child in danger is the most urgent action to be taken. Any latency in doing so increases the risk of the child being molested.
After that, the past victims can be gathered to bring him to justice. His pedophilia can be a powerful catalyst for his spiritual growth if it is used to open his eyes to the consequences of his actions. If left untouched, the catalyst may turn into poison, leaving him unaware of the cost of the infringement of free will of others, meaning him being pushed down even further down into selfishness, or STS.