Where you find a shortcut to the sewers where there is a large amount of crawlers (mutilated people) you'll find and talk to a girl, she will tell you about her mother leaving to find her father who is a hunter, but he forgets about them at times but they have a music box with his favorite music and that her mother left the box by accident
If you use this during the fight with Father Gascoigne he will be stunned, 2 times in first 2 phases, one in the last phase, this indicates he is remembering something at least
When you finally kill him you can find a Red blood jewel with the mother's name in it, given by a hunter to someone
If given to the child she will cry probably indicating it is likely that the woman had been killed by the father when she had found her, or that the beast around him had done it, but were they beast?
If you kill the father before speaking to the child, the child will cry for her mum and say she's scared
There is no title as 'father' in the church