30 Years Ago, Chol Hamoed Pesach, 5749 (1989), Rabbi JJ Hecht tells the Rebbe what happened when his 3 1/2 year old grandson, Shmuly (ben Levi) Hecht, couldn’t see Eliyahu Hanovi when reciting “Shfoch Chamoscha” at the Seder.
https://www.youtube.com/watch?v=INZlXSeaa-Y&feature=youtu.be
Today Shmully lives in Crown Heights with his wife and 4 children.