Just caught up with this thread - some people are so blinkered in their views of what other people do i.e. they think everyone is out for money. You are doing a brilliant job of providing a home for 3(?) pregnant cats who could have been put out on the streets & increased the stray population & spaying them when the time is right. And you effectively rescued the boy so what's this
problem!
I have to say i couldn't do it, nor i bet would alot of others, so well done you.
All this love is costing you money though, so i don't see any harm in you charging something to cover your costs.
Are you going to keep any of the cats/ kittens or rehome them all?