A cat has moved into my home, but is upsetting my own cats and we cannot afford to keep him?

you should put up posters, or you can post an ad on www.craigslist.com. lots of people really want to adopt cats and would be happy to give him a good home. you should probably go to their house first and check things out, look at past pet situations, etc. just in case. or you can call the humane society and find out where the nearest one is to you. if no one replies to the posters, you can easily find him a better home.