There's really no good option when it comes to extreme survival of the pack situations like the examples I've seen in Laos. It's unfortunate but the options are pretty much either bad or worst in those life and death situations.
Agree that a parent should sacrifice him/herself instead of his/her child but if that's going to cause the whole family to die too then sacrificing one child to save the rest may be the only option for some situations as hard as it is to do.