Bit complex. I have 3 sons from a first marriage aged 23-18 and now a daughter 2.5 and 1 year old son from a second marriage. The younger 2 children and 18 year old get on very well. Sometimes I can inadvertently call the youngest son by the 18 year olds name when describing something ie not to his face. My wife finds this insulting and disrespectful but for the life of me I can’t see why? Am I wrong or missing something?