How To Write A Letter To Your Teenage Son . Even as a teen, he didn’t want me washing his clothes. Please don’t forget these words. Letter from a Teenage Son Who Was Spanked as a Small Child L.R.Knost from www.littleheartsbooks.com He depends on you—not the other way around. Thank you for texting your mum at 12.06am on new year’s eve to wish us happy new year on our first new year’s eve apart. Letter to a teenage son.