Young PlumBob woke up in the middle of the night and went to the bathroom.
On the way back to bed, he passed his parent's room. When he looked in, he noticed the covers bouncing.
He called to his dad, "Hey dad, what are you doing?"
The dad answered, "playing cards".
Plumbob asked, "Who's your partner?"
His dad replied, "Your mum".
PlumBob then passed by his older sister's room. Again, he noticed the covers bouncing. He called to his sister, "Hey sis, what are you doing?"
The sister said, "playing cards."
PlumBob asked, "Who's your partner?"
She responded, "My boyfriend, Paul."
A little later, the dad got up and went to the bathroom.
As he passed PlumBob's room, he noticed the covers bouncing. He called to his son, "Hey Plum, what are you doing?"
PlumBob answered, "playing cards."
His dad asked, "Really? Who's your partner?"
Young Plumbob answered, "You don't need a partner if you have a good hand