Colour can have a strong impact on your photography. Consider the location, and colours within that environment.
Think about pastels, earthy tones, warm tones, shades of blue. Start with a selection of 4 colours in a tonal family. A well selected colour palette will tie everyone together effortlessly, and avoid the uniform feel.
Even with teens choosing an outfit within the boundary of your chosen colours, will coordinate, but also allow them to shine with their style.
We’ve created a helpful Pinterest board with colour palettes and outfit combinations to get you started! https://www.pinterest.com.au/kellyjordanfoto/photoshoot-what-to-wear/
Another element to consider is where in your home will your family photographs will hang? A room of warm, earthy tones will clash with some outfit choices, just as a bright colourful room may see a beautiful image with natural tones get lost in the shuffle, so it pays to think ahead.