Interesting idea but full of illogical absurd and stupid plots

Rating: 1/10 (19 May 2018)

1.In a situation that is all about staying alive, a sister should help protect and keep a close eye on her younger brother instead of giving him something that may cause his death.
2.Why have a baby in this situation?I do not understand. The couple know that the mother will absolutely make sounds when she delivers her baby, which will put not only the mother but the whole family at danger, but they are still determined to have the baby delivered. Then, it's fine. But why don't you live by the waterfall for a few days when your due date is approaching?
3.The father could have saved his children in many other ways instead of simply shouting. He has time to make those gestures to express his love to his daughter but doesn't have time to pick up the weapon and throw it away to make some sounds.
4.In the last scene,they could have use that sound to fight those alien but the daughter just take that important device off the amplifier without making sure whether that monster is dead or not.
5.They have a gun but don't have a silencer in such a world.
6.too much to mention it all..