so it's good to get them as fast as possible (don't wait for them to trust you so you can grab them- it will take too long and they need human interaction/forced touch soon to turn them around). Trapping them would be a snap if you skip a meal and use stinky food, a rope with a big trap (wait for the whole litter to go in, then let loose of the rope) that way noone sees a litter mate get trapped and it doesn't get dragged out for days on end. They may get a virus at the shelter but I suppose it's better than continuing in their feral state- becoming more and more feral and less adoptable! Have you named them and do they come to your call? Gosh, next time a stray comes around, you're best bet is to throw down some nip so you can see if there is any nursing going on! Poor you, hang in there and ask shelter volunteers if they can help trap and foster! You've done enough already with magoo!!!
Wish I could come help you!