Dear Abby: Why would my sister want me to be her nanny after telling me I'm a slacker?

Dear Abby: My twin sister and her husband are expecting their first child. I run a small business with my father. Although I work hard, neither of them seems to see or acknowledge my efforts. They consider me to be “sponging” off my father. They also disapprove of my relationship with my boyfriend because we have chosen to remain unmarried and not have children, although we have been together as long as they have.