My grandfatger slips in the comfort room and cannot move his right arm anymore

Maybe his arm is dislocated ir it cat be fractured.

ANSWER

The man is very short (i.e. a little person).

EXPLANATIONBecause of the man's short stature, the man is unable to reach a floor button higher than the halfway button.Meaning, the man when he goes down, he can reach the ground floor or the first floor because the elevator floor number buttons are laid out in descending floor order from top to bottom. And when the man wants to go up, his height only allows him to reach the button that will bring him halfway to his penthouse.The reason why the man is able to reach in his penthouse when it is raining is that because he has his umbrella to use in reaching the floor button where his penthouse is located.

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