My dad and stepmom deciding to have a kid without telling me

I feel so sad and guilty that I feel this way. it seems like I’m supposed to accept it but I really don’t want to have this impact my life. (They expect me to be there for this kid I didn’t ask for) I’m 24 so I really feels wrong to me. I also never liked kids and babies. I decided to go to college out of state asap just to get away from them and not have to deal with this. I tried telling my dad how I feel but my mom told me that I hurt his feelings so I’ll probably not bring it up again.

I live with my mom and brother who has autism and diabetes and I have to be the one the one responsible for him. my dad will call me at 3 am to tell me my brother‘s numbers are low bc he cannot manage them himself. my mom yelled at me to not call her if he ends up in a hospital bc I let him drink orange juice in the morning.

today I had therapy and talked to therapist about how my dad told me there is going to be a baby shower and I will probably go because I don’t want to hurt his feelings and the whole discussion abt how my life is after my parents divorced then moved us to another state simultaneously when I was like 10 kinda made me upset. My mom asked if she could eat some of the food I made for dinner so I said I guess. Then she locked the bathroom door and wouldnt let me in (we share the same bathroom bc she moved us into a smaller house for no reason..) just bc I said “I guess.” so now I’m in my room crying lol. Idk.