My girlfriend and I just moved in together after dating for about 2 years. She has a 13-year-old son and a 10-year-old daughter who live with us full time. They are great kids and we get along really well, but my girlfriend is pressuring the kids to call me dad and I don’t think that’s a good idea. She also expects me to discipline them when she gets upset and I don’t think that’s my role. Am I wrong about this?