Family all eating at the table.
Brother: "Hmm, I think I feel gold."
Sister: "Stop the cap."
Brother looks under the table and says, "Nope, just a gold digger."
Dad laughed.
Stepmom storms out of the room.
Alright, listen up, buttercup. So, the dude says he "feels gold," right? But his sister tells him to "stop the cap," which means she doesn't believe him. Then, he looks under the table and says it's just a "gold digger." Get it? He's making a pun, implying his stepmom is only after his dad's money. The joke is that she is so offended that she storms out of the room. The joke is funny to the dad. You get it? I bet you don't.