i say get his gun out and shoot her laptop....
seriously though he does need to stick to the grounding and the mother needs to realise why, when she goes to grandma's to get out of being grounded so long then the full two weeks needs to be employed when she gets home, otherwise grandmas house is just a place to go to get out of trouble. also the wife needs to understand that at 14 kids are manipulative, they will use whatever they can to do whatever they want, she needs to understand that if she caves then the daughter will see that and use that to her advantage every time saying that her step-dad is always too hard on her or something. i myself dont have kids, but i remember very well being that age.