I find it surprising actually how much these seniority rules are well-defined in many cultures, but in Brazil there is strong variation - even in the same geography. For example, a colleague who is learning Brazilian Portuguese was under the impression that "você" and "tu" were the equivalent of "vous/tu" or "Sie/du". In reality, they are just different regional ways of saying the informal you. In Brazilian Portugues…
In my family growing up, my dad’s name was “Dad” from my POV. “Father” was a strange-to-me formality that only a couple of my friends’ families use. “Hey Dad, wanna grab lunch?” is technically using a title of respect, but feels way different than “Hello, Father. Would you like to make lunch plans?”
My kids call me Dad, unless we’re greeting each other like Jerry and Newman on Seinfeld to be funny, which is something always initiated by them: “Hello, Father.” “Hello, Daughter.” kid giggles
One time I heard my kid talking to his dad and calling him “Sir”. That felt utterly foreign to me. If I called my own dad “Sir”, he’d rightfully have assumed I was being a smartass. There’s never another situation where I’d address him that way.