kubiakea,

I'd let them know that if ANYTHING happens to any of them, they will be the first people the authorities contact. They are idiots.

Set up a feeding station near your house. You can put the food and water inside a rubbermaid bin to avoid other animals eating it. You can also make a shelter out of a rubbermaid bin. Take a 19 gal. bin with the lid. Flip it lid side down. Cut a hole in it large enough for them to get in and out. Line it with newspaper and straw.

Good luck! Your neighbor's family are a bunch of jerks. They're more interested in the money from the sale of the house than the welfare of disposed cats. Too bad they couldn't be more like your neighbor.