Really need help

I love animals. All of them. I have 3 cats that I would give my life for, all of them are rescues, but herein lies the problem. One of them (and I don't know which one) has, over the last few months, begun to pee and poop outside of the litter box. Of course I can never catch the rascal in the act and I have no clue which one is doing it. It has become even harder to take care of them due to this as DB wil not help me out with the cats in anyway shape or form. With my surgery coming up and the face that I am not going to be able to deal with cat crap (Literally) I am giving serious thought to calling the shelters they came from and asking them to take them back. I have aggressively tried to find a home for the one I took in as a foster cat, but no one seems to want adult cats. I'm just at my wits end and completely heartbroken and don't know what to do.

Cats usually don't avoid the litterbox for spite, there is usually something else going on. Some things that might be the problem.... The first thing is to make sure the boxes are clean, cats will avoid a stinky box. Do you have enough boxes? The rule of thumb is 1 box per cat plus one extra. So with 3 cats you should have 4 boxes in the house. Are the boxes big enough? They should have ample room to turn and dig so they can burry their waste. Are the boxes covered? Some cats don't like the covered boxes... especially if the boxes are small. Are the cats healthy? Sometimes an underlying medical issue will cause a cat to start avoiding the box. Have you changed litters recently? Moved the boxes? A good product to clean the messes with is Nature's Miracle. It contains enzymes that destory the odors. Also, try a litter called "Cat Attract". I know a lot of people who have had great sucess with it.http://www.preciouscat.com/