Is this FAIR???

My daughters father and I got back together 8 months ago and have been living together with our daughter as a family. He still hasn't told his parents we are together and every week twice a week he goes over there with my daughter. I feel left out every weekend cuz they are gone ALL day long. He said he doesn't want to tell his parents cuz his Dad hates me and he is Old (82). Well I'm feeling left out and we are having another baby. How should I be feeling about all this??