I’m with alooknac. And the motives for these thank you notes are both suspect and transparent. My kids got into top schools without any thank you’s. They continue to write nice handwritten notes for gifts and so on. Also, at their age, I feel it is up to them. If there was a particularly nice interviewer who connected with one of my kids, and one of my kids felt moved to write, fine. If not, fine. As it turned out, the interviewer felt a connection and wrote my kid.