Q: We are having no success getting our 3-year-old (her third birthday is in a couple of weeks) to do what we tell her to do. She defies us at every opportunity, whether it’s just ignoring us or telling us “no” or even physically fighting us. We’ve tried time-out, but she won’t sit, and if one of us tries to hold her in her “happy chair,” she screams and kicks and arches her back and we’re afraid we’ll hurt her if we don’t let her go.