Just an aside, notions of "first language" and "second language" don't work well in Indian and other Asian contexts. Often, the language that people learn first

Just an aside, notions of "first language" and "second language" don't work well in Indian and other Asian contexts. Often, the language that people learn first (their "mother tongue") would be a local language (say, Marathi) which eventually ends up being the second- or third-best language that they know, superseded by Hindi and English. So, for many urban middle-class Indians, English is actually their "first language" as in the language they know best, even though it might be the third language in the order that they learned it. (Actually, even the notion of learning them in an "order" applies only loosely because you'd be learning all 3 languages at the same time). This is also true for many Chinese people. E.g. a person's mother tongue may be Shanghainese but eventually they learn Mandarin and English to a much more advanced degree than Shanghainese.