I think your SIL needs a swift kick in the tuchas! I'd be furious! And what business is it of hers how much you spend on your cats?? I say if you want to spend $500 a month on them, it's your perogative! there have been times when I was living on Top Ramen, but was spending over $100 a month on dog food, cat food, chewies, litter, etc.

I'm glad to hear that everything is ok, tho.