ORIGINAL: RFalvo69
via "offers": faithfuls forking their money while attending Mass (or when simply visiting a church).
So... your brothers are facing a disaster? Take a clue from what you do.
You don't pay to visit Notre Dame, except the towers (and the money goes to
state coffers). "faithfuls forking their money" aka harvesting some petty money here and there is not their errr main
line of business.
http://www.notredamedeparis.fr/faq/
I'm just saying their help is irrelevant (and for all I care not expected) as the French citizenry will take care of their property.
EDIT: my mistake, only the [guided] tours (and "tour" means "tower" in French) are not free. I did not pay enough attention, apologies. One of the most beautiful cathedrals in the world, which I visited as I was born and lived in Paris