Hi,
I think you are being totally fair, more than they deserve really! I wouldn't give them too long to be honest,if she says he doesn't want the kitten then I can't see them doing much to help the poor little thing. Its not like the flea stuff is so expensive either, why don't people think through the expenses before they go and get a pet,they just see something they want because its cute but they don't think long term or about the practical matters as affording vet bills and treatments they need just to keep them in general good health
Izzie