If you plan to travel to Europe from 1st January 2021 please use this link to check whether your and the children’s passport will be valid. https://www.gov.uk/check-a-passport-travel-europe-1-january-2021?utm_source=pptcheckersms&utm_medium=offline&utm_campaign=transition
Remember that your European Health Insurance Card (EHIC) will be valid up to 31 December 2020 and you might need an international driving permit (IDP) to drive in some countries. More information on travelling to Europe from 1 January 2021 such as healthcare, border control, visas, driving, insurance, pets, roaming and business topics can be found here.