Often traced back to there been friends, colleges or just fighting for a common goal such as to be the considered best, to be considered a real gamer and not a noob or just fun
In games such as Cs or Dod
While there are exceptions, a majority of clans are filled with holier-than-thou assholes who think they're really something because they have a tag in front of their nickname. Any questioning of clan members invariably results in getting insulted repeatedly, so it's best to just let them be idiots and remember what it was like to be a teenager on the Internet anonymously.
Most clans consist of 12 year old kids who think it is cool to be in a clan. Clans were cool in 2005, not so much now.
It is probably at its worst in Halo Reach and Halo 4. The File Browser consists of thousands of screenshots where clan members ask you to join their lame clan. These clans also get into fights with each other over the File Browser. No one cares about your stupid clan, and no one cares about your stupid clan drama. Just shut up and go away.
Clan Guy 2: No, my clan is way better!
Clan Guy 1: That's it we're doing a clan battle! Right now!
Clan Guy 2: You're going down noob!
Clan Guy 1: No you are!
Gamer: Shut up, clans are for chumps.
Clan name= origional family name
A number of families=a clan
clans are also know as Famlies, other families can become assosiates of the clan by marrying into it but they will never be members or 'family' because you have to be related by blood, clan or family members can be members of a gang structure but the family always comes first, membership of gangs also leads to links or ties between clans.