Before his death, a rich man signed his will.
"If my wife gives birth to a boy, she will get a third of $42,000,000 and my son will get two thirds of the money.
If my wife gives birth to a girl my wife will get two thirds of the money and my daughter will get one third."
After the rich man died, his beloved wife gave birth to twins: a boy and a girl.
What is the fair share of the money for the lady?