"To act as sandak is a great honour. There is a tradition of appointing one of the child’s grandfathers as sandak" (source).
"I recently had the great privilege of being the sandak at the brit mila of my great-grandson. As I sat in the 'chair of Elijah the Prophet' holding the baby, I had mixed emotions" (source).
"I thought for a moment that the sandek was going to pass out, but he was just closing his eyes and saying something" (Glinert)