"Bright and brilliant" joke

Nawaz Sherrif comes to Delhi for a meeting with Vajpayee. After dinner, Vajpayee says to Nawaz Sherrif: "Well Nawaz, I don't know what you think of the members of your Cabinet, but mine are all bright and brilliant." "How do you know?" asks Nawaz Sherrif
"Oh well, it's simple", says Atal. " They all have to take special tests before they can be a minister. Wait a second".
He calls Advani over and says to him
"Tell me Advaniji, who is the child of your father and of your mother who is not your brother and is not your
sister?" "Ah, that's simple", says Advani, "it is me!"
"Well done Advani", says Vajpayee and Nawaz Sherrif is very impressed.
He returns to Islamabad and wonders about the intelligence of the members of his Cabinet. He calls in his favourite
member of cabinet and asks: "Tell me, who is the child of your father and of your mother who is not your brother and is not your sister? "
He thinks and thinks and doesn't know the answer.
"Can I think about it a bit further Nawaz? May I let you know tomorrow? "
"Of course", says Nawaz Sherrif, "you've got 24 hours."
He goes away, thinks as hard as he can, calls in his Cabinet Secretary, Chief Secretaries and Joint Secretaries, but
no-one knows the answer.
Twenty hours later, the member of Nawaz's cabinet is very worried still no answer and only 4 hours to go. Eventually he
says: "I'll ask Benazer, she's clever, she'll know the answer."
He calls Benazer.
"Benazir", he says, "tell me who is the child of your father and of your mother who is not your brother and is not
your sister?"
"Very simple", says Benazir, "it's me!"
"Of course" says the Cabinet member and rings Nawaz Sherrif.
"Nawaz", says he, "I've got the answer: it's Benazer Bhutto".
"No, you idiot", says Nawaz Sherrif, "it's Advani".