My parents were married for 20 years and ever since I can remember they've been fighting, but this last year has marked the end of their marriage. In February, soon after my dad came back from his voyage (he is an engineer on transport ships and oil related stuff, has been going on these voyages ever since my older brother was 2, he is 18 now) of 6 months, he beat my mom for teaching my older brother how to shave until she ran to my room because she had nowhere else to go and gave me a chance to confront him, I told him I'm tired of his shit and that he is an alcoholic abusive idiot who can't spend 5 minutes with his family without starting bullshit. The next few days me and my mom were in and out of the house because him kicking us out and me getting my beaten up twice and verbally abused multiple times. This started the divorce and eventually my mom agreed to my dad's terms because lack of money (and honestly fucking dignity). He pays me 1000 lei (romanian currency, about 250 american dollars) every month (may sound like garbage, which it is especially since he is payed fat stacks, from what he told me once when he was yet again drunk its around 10k euro every month, prolly not that much tho I'm not sure if I should take his word for granted) and my mom gets custody of me (I should mention I'm 15 and was 14 when this all started, 16 in 5 months) while he gets 2 weeks of summer vacation and one in winter vacation. Me, my mom and my brother will live under the same roof as my dad, BUT we live upstairs (even built an outside staircase) while he lives downstairs and is going to "pay" for a wall being built at the end of the insider staircase. I told my mom this is a garbage deal, but she wouldn't listen to me and decided to take the deal anyway. *NOTHING* in their *LEGAL* agreement states anything about my 18 year old brother, who is in his senior year in highschool and going to college soon and someone is obligated by law to pay for his studies, that being my fucking mom who still took the deal.

Yesterday was my dad's 50th birthday party and my mom (FOR SOME REASON) decided to help him with, he cleaned his part of the house, even bought a fucking cake and stayed downstairs and chatted with his 2 guests for 3 hours at the same dinner table as him, acting like everything is fine and they aren't divorced. It was also a school day and I called her up to see if she could come pick me up after school (I live 7km from school and takes me about an hour to get home by foot, no buses pass by my house, I've been walking to school and back for the past 1 and a half years of highschool so it's not a big deal for me, but still a tough walk) and she said no because she "was busy", turns out she was washing that idiot's dishes, cleaning his floors and making him food.
When I found out I snapped at her and I haven't talked to her since (it's always been like this, I get mad at her for doing something very stupid and either my brother or dad gets mad at her for doing something not stupid at all and not even an inconvenience so I automatically have to forgive her because who else is she going to talk to?). I had enough of it and ignored her for the rest of the day and today until...

Two hours ago dad came upstairs on the inside staircase (which he was supposed to close up), went to my brother's room and threw his phone (that he didn't even fucking pay for) out of the window, and my mom started screaming at him for doing it so he started shoving her and pushing her back and somehow hurt her foot while screaming at her the entire time that she is a "worthless whore just as her mother and cuck father". I was torn between calling the police and not calling for a couple of minutes until I called, said what happened and magically my father shuts the fuck up and my mom goes back to her room, I tell the 112 lady that they cooled off and she told me to call if he starts acting again. He goes downstairs and mom gets keys to lock her room, my brother's and mine, I tell her to not lock mine and she doesn't. Dad comes back up, but can't reach my mom because her door is locked. He starts punching her door really hard while I'm messaging her asking her if I should call the police again, she tells me "no". Dad goes back downstairs and goes to sleep.

Fast forward a bit and mom comes to my room and tells me he us sleeping, I tell her I don't like our living situation and that it's her fault for agreeing to live in the same house as the guy who's been abusing her emotionally and beating her for 20 years, she then leaves.

I feel really bad for it and I highly regret not calling the police again or going to fuck him up myself, but I said what I thought and still think was right to my mom. This is honestly going to haunt me for the rest of my life.