When my sons fight, I make them recite Psalm 133 - "Behold, how good and pleasant it is when brothers dwell in unity ..."
And anyone who takes the behavior of TV characters as normative is foolish.
Today, my adult children all get along. The two sons (a year apart) who fought so much we had to switch their bedroom are probably as close to each other as any two I've got. They work on each others houses, and just last summer worked together on building their decks.