Capitalism is competitive, but Monopoly is merely a board game. Despite the fact that Monopoly uses a capitalist system as its structure, it is still just a board game. Capitalism’s presence does not compound this level of competition, so Monopoly is no more competitive than other board games that do not feature capitalism.
Having established that Monopoly is a mere board game, it is time to establish that board games do not destroy families. As such, Monopoly does not destroy families. Board games might sometimes create familial disagreements, but when those arise during a board game, they are no different from the disagreements that happen over who is washing the dishes. The competition and friction that arises among family members during a game of Monopoly exists throughout their daily lives, and may be amplified by a game of Monopoly. But since this tension does not exist only during games of Monopoly, it is that overarching tension that destroys families, not Monopoly itself.