What should I write to my grandmother if my child isn't very good at writing in Russian?
Take the shortest option of the three lines and don't aim for length. The salutation, congratulation, and signature already make up the actual letter. Mistakes in such a card don't matter because grandma is waiting for a message from her grandson. In a year, the same child will write twice as much if you start small now.
Is it really necessary to write it out by hand, since you can just send a message?
You can send it, but handwriting works differently. While the hand is writing the letters, the child says the word to themselves and remembers its spelling, which doesn't happen when typing on a keyboard. Plus, grandma will put a paper card on a shelf, while a message will get lost in the correspondence within a week.
How can I get my child to write to Grandma if he refuses?
Forcing is useless, but removing an obstacle is possible. Most often, a child refuses not the grandmother, but a blank sheet of paper on which it's unclear what to write. A ready-made text removes this fear, because rewriting is easier than coming up with something. Then, drawing, stickers, and an envelope come into play, and the work proceeds on its own.
