It would be unprofessional to call a random stranger brother or sister (not to mention that it’s easy to misgender someone on the internet, and therefore look like a fool), even if it’s acceptable in some cultures. And if it’s not acceptable in their culture… Well, then you’d look like a weirdo who calls complete strangers brother or sister, plus some people might think you’re trying to scam them or something. @catwriter Thank you for giving me such a nice suggestion ❤️