A family of four from Shanxi Province travelled to Tianjin the other day. They were walking along the Haihe River when their young son accidentally fell into the river while playing near the water. The father, who could not swim, jumped into the river to save his son. The older brother also jumped into the river to help. The mother was extremely anxious and intended to save her older son. At that moment, the father managed to save the younger boy, but he saw that his wife and older son were also in danger. He called out to passers-by and onlookers for help, hoping that someone who could swim would rescue his wife and son. However, no one came to help. Do you think people have become indifferent to others nowadays?