I can't stand it. My dad goes out at night and dances with those girls in the square. My mom had a big fight with him many times before when I was a senior in high school.

Three scenarios, one continue to fight, two your father does not dance. Three your mom falls in love with dancing too.

Something like this is easy to say, but it's really hard for outsiders to give advice about your family. From your simple description, it is not difficult to see that changing your mom is more difficult than changing your dad, try to find something that can be done at home for the elderly and like to give them something to do, so that your dad to change the habit of going to the square on the good. For example, playing mahjong, or learn from our Cantonese people drink night tea, is in the in the nightclub night snacks. In fact, both of these are ways to deepen communication, communication more will be better.