The simple answer is yes! Mostly in the contemporary stories. In HOW TO MARRY A STUART BROTHER, a story about two brothers and their road to married life I wrote about my brother and sister-in-law. After ten years of marriage they found their marriage was never registered. While they planned another wedding (which was awesome) my characters had to do some soul-searching. My story, HAPPILY EVER AFTER is about a top romance author who gets a horrible review. Yes, you guessed it. I used a review I got for my first book in the opening chapter.
