What a fun thread idea! Admittedly I don't take a ton of pictures of my teens (and the ones I have tend to be group shots with cousins) but here's what I came up with:
First up, we have the Bernard Triplets: Rey, Finn, and Padme
https://i.imgur.com/7G1xNIo.jpg
Then we have their cousins the Kauker triplets: Celestial (yellow) Eclipse (blue) and Aurora (pink)
https://i.imgur.com/3dGmvTP.jpg
Next up we have the Palmers: twins Mark & Harrison, and their sister Carrie
https://i.imgur.com/CUlONHX.jpg
Then we actually have a family without multiples, Chimney and Balcony
https://i.imgur.com/S3ZRN9j.jpg
Just in case you wanted to see what my profile pic family looks like now, here's the Flendersons: Snow, Wind, and Sunshine
https://i.imgur.com/l6USEYA.jpg
And finally, Gemini and Libra Kauker (their first cousins to the triplets)
https://i.imgur.com/pQMcNYh.jpg