Need some assistance rehoming a momma and kitten

about 6 weeks ago, we had a feral momma cat wander into the garage and have (3) male kittens. Obviously, we couldn't just kick them out and all of the shelters/rescues we called were either full or had kill policies that we weren't comfortable with. Unfortunately, we don't have the space for another cat with 3 dogs. I have found good homes for 2 of the kittens, but the third and the momma I'm struggling to locate somewhere that can promise me they wont put them down. If anyone has suggestions of who to contact that would be willing to take them or different avenue's, I would be most appreciative. The momma has really turned into a lovebug, even though the first few weeks she would hiss anytime I'd get close to her. now she craves pets and lets me pick her up. Really a pretty sweet cat. Or even if you know someone who might be waiting for the Cat distribution system to find them. I really want them to go to good homes.