This is the time to get the mother cat and at least get her spayed. She is no doubt frantic looking for her kittens, and the best bait for a mom cat is her own kittens. Have their eyes changed color yet? If so, they are more likely closer to eight weeks old. YES they can easily be tamed. If they are kept in a cage the task is much easier, as you aren't scaring them chasing them to hold them. I would call animal control, or area shelters and find out if they have traps available to trap the mom cat. If you put the kittens in a carrier behind the trap (be sure the trap is very clean) and cover the carrier with a sheet, the cat will most certainly go into it to try and get her kittens back. Just taking the kittens isn't fair to the mom cat (though you & many others mean well) it still is leaving her intact, and capable of having two more litters before years end. If you need help, PM either Leslie or me....and good luck...do the right thing!