The firts:
-One day a girl celebrated her birthday. Two days later, her older twin brother celebrated his. How is this possible???
The answer is: The boy, the older twin, was born early on March 1st. Then the boat crossed the International Date Line, and the girl was born on February 28th. In a leap year (any bisiest) the younger twin celebrates her birthday two days before her older brother.
The second:
-A man is lookig at a photograph of someone. His friend ask who it is. The man replies "Brothers and Sisters, I have none". But that man's father is my fathers's son. Who was in the photograph???
The answer is: His son.