Same thing here, 3 Daughters the Youngest one thinks she knows everything, after the 3@4 time of screwing up her laptop, I told her next time you on your own, and I will block the mac address on the firewall and you will not be on the network @ home... 2 months later and she is still not on the network, and I now feeling the pain as her older sisters will not let her use their laptops etc...
ages 22, 20 and 17... the Youngest is the biggest pain in the ass.... you would think she would learn!