In Their Skin (2012) on Netflix

Mark Hughes travels to his isolated cottage with his wife Mary and their son Brendon to recover from the loss of their little daughter. In the morning, Mark wakes-up with a family dropping wood on their porch. Bobby, Jane and their son Jared tell that they are neighbors that brought the wood to welcome them and Bobby asks if the HMark wouldn't like to have dinner with them. During the dinner, Mark has an argument with Bob and expels him and his family from his house. Soon they find that their house is under siege of Bob and his family that invade the house. When Mark's brother Toby arrives in the house to visit his brother and his family, Mark and Mary learn how insane the psychopath Bob is.