Answer:
What comes once in a year twice in a week but never in a day?
I am black white and read all over.
What has a face and two hands but no arms or legs?
The letter S is added to pluralise most words in the English language. eg. Letter to Letters Word to Words and Language to Languages. But I am a word that is pluralised with the addition of the letter C.
I tremble at each breath of air and yet can heaviest burdens bear.
I am your mother's brother's only brother in law. Who am I?