A final clue

The final clue for the code to the gifts.

When I go shopping, I use these numbers.

They figured it out! Shoe sizes. They had to figure out who belonged to what number (although shoes sizes are tricky as they can be different with different brands). I used the girl's ballroom dance shoes. Jaley - 6, Jenna - 8, Julia - 9. Tennis shoes for the boys. Kerst - 3, Kendall 7.

Now to figure out what to do next year. Suggestions for a code? What code would you do with your kids?