Einstein’s dad: Damn son, it’s about time.
Explanation: This joke plays on the double meaning of “damn son.” The punchline humorously implies both a proud acknowledgment from Einstein’s dad about his son’s achievement and a playful twist on Einstein being a “son” in the context of the theory of relativity, suggesting it took a long time for the paper to be published. The clever wordplay creates a lighthearted connection between family dynamics and scientific success.