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The COVID-19 pandemic has affected all Canadian families, with some impacted differently than others. Our study aims to: (1) determine the prevalence and transmission of SARS-CoV-2 infection among Canadian families, (2) identify predictors of infection susceptibility and (3) identify health and psychosocial impacts of the COVID-19 pandemic. This study builds upon the CHILD Cohort Study, an ongoing multi-ethnic general population prospective cohort consisting of 3454 Canadian families with children born in Vancouver, Edmonton, Manitoba, and Toronto between 2009-12. During the pandemic, CHILD households were invited to participate in the CHILD COVID-19 Add-on Study involving: (1) brief biweekly surveys about COVID-19 symptoms and testing; (2) quarterly questionnaires assessing COVID-19 exposure and testing, vaccination status, physical and mental health, and pandemic-driven life changes; (3) in-home biological sampling kits to collect blood and stool. 1462 households (5378 participants) consented to the CHILD COVID-19 Add on study: 2803 children (mean age 9years; SD 2.7, range 0-17) and 2576 adults (mean age 43years; SD 6.5, range 18-85). We will leverage pre-pandemic CHILD data to identify risk and resilience factors for susceptibility and severity to the direct and indirect pandemic effects. Our short-term findings will inform key stakeholders and knowledge users to shape current and future pandemic responses.