When I was growing up, we called siblings ‘Brother’ and ‘Sister’ as often as by their first names. We were raised by old people with old habits, but I still call my brother ‘Brother’ sometimes. I have lots of old letters that are addressed ‘Dear Brother’ or ‘Dear Sister’, instead of names.
Old stuff dies hard ;-)
OTOH...throwing everything "old" out, replacing it with really stupid/meaningless stuff, or just NOT having any rules at all, debases society, tears the woof and weave of commonality of a nation apart, and NEVER achieves something "better"! But all of this is very far afield re the topic of this thread and best done privately or on a suitable thread. :-)