Kitten Adoption Resources

My brother has 6 kittens and a very very sweet far too young mama cat that were found on his property and in need of a home(s) or suggestions for proper resources to get these little guys taken care of. We have tried reaching out to many groups including GNAR, Weatherford Whiskers, Jack of All Cats, County Animal, and haven't received a reasponse from any of them. Any suggestions of where to take these furry felines? We think they're about 5-6 weeks old and want to keep them with their mama until 8ish weeks. I am posting this for my brother in Fort Worth/Arlington as he's not a cat person, but I'm on the East coast. He is currently checking on them daily and providing food, but isn't in a position to continue this longterm or serve as their feral cat guardian. Would love to get these babies good homes.