Camaro, Challenger or Mustang?: comfort and fun for driver; comfort for passengers front and rear

If your looking for Comfort, the Challenger is the only one of the three that adults can comfortably ride in the rear seats for any lentgh of time. I wouldn't think that you could get five people in any of them.
I own a Mustang and personally think its the most fun to drive, the Camaro was like looking out of a bunker and the Challenger is a big comfortable cruiser and not very sporty compared to the 'stang.

If I were going to get a sporty car for a family car, I'd get the Challenger giving up some driving fun for a lot more comfort.