DEAR ABBY: I’m turning 17 and live with my dad and his girlfriend. They have broken up four times, causing my dad and me to retreat to the basement where we live the peaceful, happy life we did before he met her. When they first started dating, she was very nice, and I liked her. However, because my mom is gone, she decided to assume the role of “mother” after they moved in together. I don’t think she has the right to make decisions about me just because I no longer have a mother. Dad has told me repeatedly that ...