Whether family members with red team will turn red should be related to whether family members have contact with people with red team during the incubation period of COVID-19. If you live together and have contact, other people's health QR codes will turn red. If other people are family members with people in red team, but they don't live together and have no contact during the incubation period in COVID-19, then other people's health QR codes will not be red.