Who is in the wrong?

Okay. So this is my situation, I really need to talk about it. So my mom is dating an older man named Fred. He’s a retired veteran with ptsd and religious. He has 5 or 6 kids (not sure exactly). One of his sons is gay and he claims to not associate with him because he’s gay and it’s wrong to him. He also calls himself the “alpha male” and refers to himself as god and has erectile disfunction and is a complete asshole. They’ve been dating over a year and in this year. I was 16/17 when they started dating, I watched his terrible, disrespectful bad little boys (for cash of course), worked 2 jobs, made great grades in school, we spent the night at his house (my sister and I), and had no issues toward Fred. I actually liked him. It was until slowly he started acting different. We stopped going over there and I stopped seeing him. He would get mad at my mom when she wanted to spend the day with us and stay at home for the night. It got to the point where I was a bit jealous because she would go over his house and cook meals for him and his children and we had to stay home and eat noodles! My sister and I felt it wasn’t fair and talked to my mom about it and she said that we were old enough to care for ourselves (mind u my sister was 12 at the time) and that she has to have a life too. Now I’m 18, recently turned 18 in August and I have a 6 month old daughter. I got pregnant my senior year of high school (and Fred is the one who kept saying I was pregnant before I even had a clue because I sat on a bed/baby crib or something but anyway) and gave birth to my daughter a week or 2 after I graduated in May. When I got pregnant is when the distance began. But.. Since then I stayed with my daughter a few months and went back to work in September just to lose that job in November. So here it is December and I’m going to be starting a new job next week. I’m trying to save money to move out on my own and get on my feet, but it’s not going too well. It’s my older brother who is 22 also recently moved in with us in our 2 bed room apartment with my little sister too. So basically it 5 people living in one space. My mom usually stays the night with her boyfriend so she’s hardly here but she pays bills and leaves us the car to do whatever (please note that no one has a license my brother drives illegally and I can’t drive because I get anxiety even thinking about it but I do study to take my exam to atleast get my permit so I can start to drive). So recently my mom got pulled over and went to jail for 3 days. She called and told us to contact her boss and her boyfriend Fred. We did like she asked and Fred didn’t answer. Instead he decided to text my brother novels about how we are holding my mom down and using her and are disrespectful towards her. All we did was let him know my moms situation and asked him to get her out. My brother replied that he didn’t want any issue and that Fred’s only job was to make our mother happy. He continued to go on saying he was basically going to fight my brother and “ruin him” and continued to bash me saying that my child’s father was gay and saying I selfishly brought a baby into a bad situation and calling me a bad mother and saying I didn’t have a drive about myself. Basically saying the same about my brother minus the kid part. He then said he hopes it doesn’t rub off on my sister (who is a straight A student). He never got my mom out, she was released and we told her about it and she just shook it off. She claimed she was done but went right back to him. So last night after she got home from work he came into the house and my brother, Fred, and I went at it. Fred almost got shot if it wasn’t for my mom holding my brother and stopping him from grabbing his gun because he said he was going to blow my head off and throw me out. He swore he would stop every good think we ever had coming for us and he will make it his duty to make sure we never keep a job & so on.

Let me add that my daughter is well cared for. I never ask my mom anything in regards to caring for her. Me and my child’s father do have drama of our own but he does make sure my daughter has everything she needs and more. Never asked her for one diaper or wipe. Only think I ask her to buy are things she claims the baby needs (like outfits though she has a closet full) Since she wants her to have them so bad. I have $400 saved towards a car, that I would’ve already had if my mother didn’t spend the $700 I had saved previously while I was pregnant..

But anyways I’m jus confused. I’ve been nothing but nice to this guy and he hates me. Constantly talking down on me. It’s causing me to not even want to be associated with my mom because I’m so disgusted with him! Though I love my mother to death. Advice? Anything?