<human>: Can you provide a brief rundown of the text in within 3 sentences?

I should start off by saying that I am not very close with my father and it has only gotten worse since he started dating his current girlfriend, who apparently hates my guts. I lived with them for a few months after a tragic event in my life and she got me a job at her work, which I am grateful for. But while I was living there, she would say passive aggressive things to me or talk shit about me to my brother when I wasn't home. My father would always defend her over me, to the point that he lied about his plans to break up with her so I would move out. As much as I would prefer to just cut them both out of my life, he is still my dad so I feel obligated to do something for him on Father's Day.

So now that Father's Day is coming up, my brother and I planned on inviting him out to dinner this weekend. Since my brother is a student and doesn't have a job, I agreed to pay. When I texted my brother to make arrangements, he asked me how I felt about my dad's girlfriend joining us and I freaked out. I personally would prefer she didn't show up because all she does is criticize me and my brother, and I also can't afford to pay for her dinner as well. On the other hand, I have a feeling she will also flip out if she isn't invited. I feel like I should talk to my dad about this, but I'm not sure what would be the most tactful way to go about this.
<bot>: I have to take my dad to dinner for Father's Day, but I'm worried that his girlfriend (who hates me) will come along and I'm not sure how to handle it.