How do you break a child, ages between 9-12, from lying? These are my grandchildren and I've been discussing punishment with my son. I've explained to my grandkids that they loose the trust of the people they lie to, but apparently it didn't sink in.

My son is thinking of dumping about 1/4 of a cup of water on their faces when it's time to wake them up. I don't think the punishment fits the crime but I don't think it's cruel and unjust.

Has anyone out there come up with something that works that isn't spanking?

Any suggestions welcome.