For proper family portraits it's best to stick with classic, timeless looks that will not only be beautiful now but also in 20 years, and keep the wardrobe color palette similar so it looks like the group shot was well planned.
And you should hear the music. Incredible, amazing music, like nothing you've ever heard, music that almost takes your head off, you know? That makes you want to scream and jump up and down and break stuff and cry.