The impact of the public health measures adopted to control the COVID-19 pandemic on the mental health of parents and children is unknown but is likely to vary by existing vulnerabilities and social inequalities. New information is vital to inform future policies and recovery. A number of rapid cross sectional surveys have started to collect data on adult and young people’s mental health during the COVID-19 crisis. However, such designs lack important information about mental health preceding the pandemic to more accurately understand changes and risk or resilience to showing a rise in emotional and behavioural problems. Thus, data in longitudinal studies is especially important. There are over 800 ALSPAC next generation children ranging in age from 0 – 11 years, with the majority at the younger ages of under 8 years. This is also an age range which has not been included in existing efforts nationally, with existing surveys focusing on school age or above. In ALSPAC-G2 children and their parents have already provided data from their parents before and during pregnancy and in the children from birth. Pre-pandemic measures include mental health in parents (and grandparents) and emotional and behavioural problems in children. By re-contacting families at this time and sending a brief online questionnaire to repeat emotional and behavioural problems scales, as well as COVID-19 specific worries matched to other national surveys, we can understand the immediate impact of this crisis on children, the extent to which this is linked to the impact on parents and possible protective strategies such as keeping routines, as well as track this as the cohort grow up.