The one-nudge rule
One behavior per letter. If you mention sharing, bedtime, homework and screen time in the same paragraph, the child hears only the criticism. Choose the one thing that matters most this month and frame it as a skill to practice, not a character flaw. “You are learning to wait your turn” is a coaching sentence. “You are not being patient” is a label.
Praise first, specifically
Two specific good things before the nudge. Not “you are a good kid” but “you carried the groceries in without being asked” and “you kept trying at the piano even when the song was hard”. Praise effort and choices, not fixed traits. A child who hears “you are kind” may avoid situations where kindness is difficult; a child who hears “you shared your lunch on Tuesday” knows exactly what to repeat.
Wording that works
Instead of: “You must stop being naughty.” Try: “I know you are practicing being gentler with your brother's things.” Instead of: “Santa is watching you.” Try: “I am writing this because I am on your side.” Instead of: “You were bad yesterday.” Try: “Yesterday was hard. Today is a new page.” Instead of: “If you do not improve, no presents.” Try: “I would love to hear how you handle it this week.”
The second version in each pair names the behavior without making it the child's identity.
Three example letters
Example 1 — sharing, age 5.
Dear Leo,
I heard you let your cousin use your red truck, even though it is your favorite. That was a hard thing to do, and you did it. Keep practicing that. The reindeer are learning to share the hay too, and they are not as good at it.
Merry Christmas, Santa
Example 2 — bedtime, age 7.
Dear Ada,
You have been working hard at school and you helped Mom carry the groceries. Thank you. I hear bedtime is still a battle. Try one more page, then lights out. A well-rested elf is a much better wrapper of presents.
Merry Christmas, Santa
Example 3 — screens, age 10.
Dear Sam,
Your science project was excellent, and you finished it without being reminded. That is real focus. I also hear the tablet is hard to put down. Try leaving it on the kitchen counter at dinner. The evening may be slower, but the company is better.
Yours, Santa
What to leave out
No threats, no comparisons to siblings or classmates, no “naughty list” warnings, no mention of weight, grades, money or private family matters. Avoid diagnosing the child in a letter. If the behavior is serious or connected to a larger struggle, a Santa letter is not the right tool; talk to a caregiver, teacher or professional and keep the letter warm.
Pair it with a certificate
A Nice List certificate can name the effort you want to see more of: “for practicing patience with your brother's things”. Give it after a good week rather than before. The letter can hold the nudge; the certificate holds the praise. Any letter pack includes the certificate generator.
Free and paid letter packs
Three letters a day are free with the three free stationery designs, including the behavior preset. A one-time $4.99 letter pack adds 10 credits — one letter each after the free daily allowance — plus six premium designs, the certificate, elf reply letters, the envelope template and no footer branding.