I'm so sorry that your Mom needs to find a home for her kitties. Have you posted fliers at the Vet's in your area? That might be a way to get the word out. Also, try contacting No Kill shelters in Texas. They will foster the kitties until a good home can be found. But, they may not be adopted together.

Here's a place in Bryan-College Station, Texas: http://www.thecatscradle.net/ but there are many others.

http://www.adoptapet.com/States/Texas.html

Good luck. Please keep us posted.