We got one last week. K1 had spent some time crafting a letter to Malia in February and I think had pretty much given up all hope of hearing from her when a letter arrived from Michelle Obama. It looked like she (or someone) had given some thought to it even though it was a form letter - it looked as though it had been written by pulling in different paragraphs from different form letters. I don't know why I say that but the last paragraph seemed to read differently from the rest of the letter.
In any case, K1 hurriedly wrote a reply to Mrs. Obama. I did not encourage her nor did I discourage her. At most I enabled her. Hope the Secret Service doesn't tag her as a stalker. :)