Correct Version : My brother and I visit my grand mother every Sunday for dinner.
Since weekends and weekdays are a pronoun you have to capitalize the word "Sunday".
For more information on how to properly capitalize visit : http://www.monash.edu/about/editorialstyle/editing/capitalisation
I hope I helped!
Authors use a different fairly of sentences to express different feelings to make the ready understanding more (my educated guess)
God uses the rainbow as a sign of his promise never again to destroy all life on Earth
Answer:
b is the answer for that question