Travelling home with 5 year old DS from a beautiful holiday yesterday evening. Got to the airport and making our way through security when a couple in front with an older pre teen child started arguing. Man was pushing face into his wife and cursing, and pointing his finger etc. Wife was arguing back. The young son was standing in watching between the pair and heartbreakingly didn’t appear frightened by it. I was trying to shield my son from seeing but as in an open queue this was hard. My son said that dad said: repeat expletive. I explained that that wasn’t appropriate way to speak to anyone and we agreed on that but I have been shook up by it and also feel bad that no one, including me intervened.