Our question is for our son's family with their two young children, is there enough time for a Dublin City visit and then to return passing through airport security reentry for their connecting flight? They will have a six hour layover between flights in June, San Franciso to Dublin to Duesseldorf with Air Lingus. Thank you for your response.
See this recent thread on the same timing: https://community.ricksteves.com/travel-forum/ireland/long-layover-in-dublin.