CCL...well you know there's a daddy cat around somewhere, and maybe a few at that! Perhaps one of the tom cats is trying to 'dispatch' the kittens so he can sire a new litter. Some toms can be incredibly aggressive toward kittens! I'd get a trap and get them all...especially after reading all the good news about Mowgli! They little grey lady probably could use antibiotics too. Adorable litter, and if you need any tips on trapping, or have a great deal of patience, you could get the most outgoing two using a rope to control the door. The fraidy cat looks like a tough one! Good luck...and don't wait till they get older...