Fabrics, textures & colors
Mix things up a little and add some depth by wearing different fabrics and textures, denim, wool knits, silk, linen etc. In a family shoot, co-ordinate outfits using a complimentary color palette, but avoid being too matchy matchy!
Stay away from graphics and florescent colors. Please, don't let your kids wear those athletic shirts that are bright neon orange or yellow. What that means is that your kids face will be bright neon orange or yellow. Graphics tend to go out of style so I suggest staying away from them.