Letters to moms are the second-most common unsent letter after letters to exes, and they tend to be the longest ones. That’s because a mother is the one relationship where you’re never just one person writing — you’re eight year old you, and fifteen year old you, and the you right now, all writing at once. A phone call can’t hold that. A letter can.
The letter often takes a shape that surprises you. You sit down thinking you’ll write a thank-you and end up writing an apology. You sit down to write an apology and realize you’re writing a love letter. Let the letter go where it goes. You can edit later.
Two ways it most often gets used: gifted on a birthday or Mother’s Day (she opens the link, answers your secret question, cries), or sealed as an “After I’m Gone” letter — for her to read if she outlives you, or for her family to read about her after she’s gone.