“I’m writing because I’m concerned about my younger sister, Tina. She’s a junior in high school and is a quiet, disciplined, studious student. The problem is that our mother isn’t a normal mother – she’s an outgoing, fun-loving, partying lady! What concerns me is that Mom thinks Tina is letting life pass her by, so is encouraging her to attend parties where alcohol is served, go out with wild guys, all in the name of having fun. How can I help Tina not make a terrible mistake?’