I was brought up to think it's rude to shout between rooms in the house - if you want to talk to someone then you should go to the room they're in and speak in a normal voice.
Only now I live in a very vertical house, with 3 small children and lack the will time and energy to keep trotting up/down to wherever they are. I am forever shouting upstairs or downstairs to call them down/up, or ask them a quick question etc. Each time, I feel a sense of wrongness about it!
Sometimes I tell one DC 'can you go and call the others for lunch/tea/whatever'. Invariably, they stay standing right next to me and just bellow at deafening volume 'DC2/3 COME UP FOR TEA NOW!!!!!'
It always makes me feel I am clearly not instilling good etiquette in this particular area. Or am I just bonkers, and it's normal to shout across the house for someone else's attention?