i need help finding a title of this movie. vague

This movie moves around rentals very often. It's from the 2010 decades. If I give you a small description of what I can remember. It just happens to be something that moved the screen. It was about the guy who attended to his family's dinner then he accidentally witnessed the murder of his young son(maybe it was his daughter) and his wife at the same time. I don't even have a good description for this scene. Because it seemed to be so fast, fat and violent. He might have been a bartender or something because he discussed the discovery of casual drinks. And, he was dressed nicely.