Urgent guys , really need opinion in this.

Is it my fault?15f So I often put up the financial issues of our home infront of my mom and i complain to her that why dad did this did that. Cause i can't bring myself to ask him those questions directly. I actually dont like to talk abt finances infront of my dad cause he already has so much burden , so i ask all that through my mom. I actually fear him too while talking all those. Today my mom put up some questions and asked dad normally. But he doesn't like why my mom asks abt him loans, lands or our finances ,he gets irritated ,frustrated starts abusing and all.He can hear advices from other people like his friends,his family members but not from my mom He gets so angry when my mom points it out even though my mom normally suggests him in normal tone. Whenever mom tried talking abt those finances and loan he always get so much worked up and this has also resulted into many conflicts too. He then starts telling my mom that why she doesnt earn by herself if she has so much problem and even abuses her and complains to her sister blah blah.he was also kinda abusive too in the past but not now though. But today it was different. We were talking normally only and my mom told him a solution but idk at which point he got so angry , told her clearly this time and explained her not to do all this again n again otherwise things wont end well. He was so angry but when he said to my mom that he is tired hearing it again n again he broke at that time, i literally saw his tears for the first time. His voice was broke , he couldn't speak properly. I literally felt so worst like this is all my fault. I feel so bad for my dad. Also one more urgent thing, i get it that its my mom fault but my dad abusing her , taunting her for not earning money , going to her family, threatening her for domestic violence is justified?i do feel bad for my dad but i feel much bad for my mom.i dont think she deserves this all even if she questioned a little bit. I feel bad for him but also not at the same time. Like first he did all the financial things hiddingly from my mom and when it went wrong even then my mom came to know abt it through some relatives. My mom is suffering too in all this, she takes so much tension that her health is deteoriating too but my dad i dont think he takes too much tension. I can tolerate anything but i hate it when my dad threatens her that he would do domestic violence. I as the eldest child in my family , they make me the middle man in their conflicts and its difficult for me too bcoz i dont wanna upset my dad as he already has so much outside and his parents burden but most importantly i dont wanna upset or betray my mom bcoz she atleast deserves support from her children. But in this all somehow i end up getting so much disturbed.