*a little late, but I'll reply*
When I was 10 both my sisters moved away and I was left alone at home with my parents, and then the fighting began, I could never hear what it was about etc. but it was always my mum who started it. I tried talking to other people on school to hear what they did, but they said they never did do anything about it. After listining for their fighting for days/weeks/months [can't really remember how far it whent] I called my sister crying because I thought they were going to get a divorce. My sister then called my mum the next day and she told her what I had said and what I had heard.
After that they stopped fighting at night and behind my back, so everytime they have a disagreement now, I exactly know what it is about, but it is NOT like it was before. Before it was a fight, now it's a disagreement.. (I can tell from back then when they are fighting/not)