Families fight and argue because they are humans as much as others are. Family doesn't necessarily entail the absence of disagreements. It just means they come from a common source, a shared source that is.
The family, like every other institution, would have to work together to ensure that the mutual benefit of everyone involved. Like every organisation, there must be understanding among every parties to forestall the break down of sanity and order in the home.
Most homes have people who are not in agreement, who are constantly at loggerheads, because there's no understanding.
Also, there should be clearly defined principles and etiquette. There should be boundaries set and everyone should know their role in the home, or as a member of the family. When this is done, you'll see that the arguments and fighting would be brought to the barest minimum.
Many homes where there's understanding and every one knows they are loved and cared for, experience little, if any, fighting all year round.
Everthing bores down to understanding. This is so because understanding makes a man of consistent character!