Both myself and my wife spent our early working years at the heart of a catholic community in a very similar city, myself as a colleague, my wife as “them” that is she worked for the local authority.
The one thing that stood out was, despite life’s problems, the local priest was the law, I think, especially as Robert has commented on the church being close at hand that the priest knew full well who was the mother, and probably who the father was.
Amelia was told by the matriarch of the extended family Go and register the birth and she did just that.
It was the norm then for older sisters to look after the young ones, maybe she formed an attachment to the baby and that is why John ended up with her,
One thing is certain, we are not going to find the father

Mike