The King Cousins (The Story Girl #1) by L. M. Montgomery

Sara Stanley, the Story Girl, can captivate anyone who will listen to her tales. In this first book of the series, brothers Beverley and Felix arrive on Prince Edward Island to spend the summer with their cousins on the King Homestead. These curious and imaginative children set out to find out about the existence of God. What follows are childhood antics, tall-tales, and legends from a time long past.