Her Dress is AS RED AS A GUMAMELA
this is a recurring argument between my parents and my younger brother, who’s adamant that he should be able to refer to by my name.
the simple answer is that ‘western’ siblings, even those with large age gaps, typically view each other as equals within the family structure. that is, the hierarchy is parents > children rather than father > mother > older siblings > younger siblings (this reflects both the ageist and patriarchal nature of indian social structures, since husbands are almost always older than their wives).
broadly speaking, western cultures are more egalitarian while indian culture is more hierarchical. this isn’t to say that there isn’t social stratification in the west, but it’s not as rigid, and age isn’t generally viewed as a meaningful marker. indeed, most ‘westerners’ would bristle at the idea that someone is owed deference simply be virtue of age, while reverence for elders is embedded within many eastern cultures.
additionally, as some other answers have noted, english has comparatively fewer words to denote specific familial relationships, a potential reflection of the values dissonance between the east and west, i.e, individualism versus collectivism.