My own health code has been linked with my family's, but they didn't flinch. Why can they log in by themselves?

Because the health law has the function of managing family members. Whether to return or not does not affect the home login. Family members are added to the health code to better understand your family situation. Once you have close contacts, you will find your relatives in time to isolate them, because sometimes not everyone scans the places we go in and out, and the daily trajectory of living in a room is different. If a person is diagnosed, he will take measures to the people around him more quickly.