Sometimes when you as an Eve are looking for a good place to make a camp you have your kids exploring the area by them self.
So when you don’t see each other any more, it would be nice to signal your location to the kids, so nobody gets lost. So i thought maybe we could whistle so the other person knows where to go.
I agree with you. when i became eve, i often missed my family 
What about a whistle that can be used for everyone? It should also be only heard by other family members of the person who uses the whistle. I think short shaft + adze is a good recipe.
I feel like eves should be able to whistle unlimitedly with no cool downs as a bonuse for eve players.
@Crazy_kvo i like the idea of a whistle for everybody else but it should probably have a cooldown to prevent players trolling with it.