Feeling irritated, Samuel was about to leave his study for a shower when he got a call from the family home. It was his mother. "Samuel," she said, "tomorrow's your grandfather's birthday. Don't forget to bring Eli for the family dinner."

Samuel frowned, and said, "Got it."

"And of course, expect your grandfather to ask about grandchildren." She laughed and said, "Better prepare yourselves."

Samuel hung up without responding, still reeling from his ...