“…In contrast, during the national quarantine period, non-LBC could obtain more consideration and focus from their parents, which supported the parent-child relationship [ 23 , 44 ]. During the preliminary COVID-19 outbreak, LBC online learning motivation and engagement were primarily poor, as caregiver grandparents found it difficult to support and guide online learning via electronic devices, and follow-up by migrant parents was complicated by the pandemic [ 23 , 49 ]. Subsequently, due to poor communication between migrant parents and LBC regarding controlling the pandemic, the children faced a substantial fear of COVID-19, depression, stress, and anxiety [ 16 , 32 , 43 , 45 , 46 , 49 , 50 ].…”