I agree that you've lost enough already. Plus with your little ones and these animals not being afraid of people, its really only a matter of time until something REALLY bad happens. You've got some little, little ones too. I would take care of these ASAP.

Don't know how much food is around for these guys, other than your livestock, but as soon as they start to get hungry, they get even bolder. We've had similar things happen in Wyoming when I grew up on the ranch. The sooner you get rid of these the better.