I had a daughter last year jan 2020. My bf and I have been together for 5 years now.  He has four kids, ages range from 7 to 17. I met the kids a couple of years ago, we blended pretty quickly since their mother went back to rehab, at that time it was for a whole year. And at that time the kids were getting ready to go back to school and their dad was going back to work also. I had to help my SO with picking up his kids from school and dropping them off at home. I was doing this while I was pregnant.  They didn't know. It was definitely  a rocky start. I came into this relationship dreaming that the kids and I would get along chit chat about things. But that wasn't as I thought. 

Fast forward to now. The connection to my skids is still as rocky as it was before.  But now I have an almost two year old, who definitely a lot of work and a lot of patience.  I no longer feel like a gf and feel that I have a partner.  It's more like a housekeeper and a cook. That lives here.  My SO is pretty much gone throughout the day and majority of the night. He owns his own business.  He is a good dad , but not much as a parent.  His boys are entitled and think they can do whatever they want because the dad owns the house and I don't. Their dad yells at them on a constant base about them not doing their homework and doing their chores. Now that our daughter has become more mobile and I'm starting to see when SO goes back to work at night. Her brothers push her away. But when dad is here they act all nice and play with her. They blame her for making a mess they made. I want to say something about their behavior but with previous experiences with trying to discuss how they act towards me their dad immediately brushes it aside stating that they're good kids and that I'm just being mean to them, that I don't talk to them. 

I'm not sure how to go about discussing with my SO about this.