回复: 蒙特利尔让法语流利需几年?
same as u, i speak mainly chinese to my son at home(sometime mixed language), his english and french are learnt from his daycare his teachers are all perfect bilinguals.
"perfect bilingual" at the elementary level, not professional level, could be "less perfect" than locals. if you could translate written academic cantonese articles to french ones, that is so-called multi-bilingual.
Infants could lose their speaking ability and children could face difficulties if they are too exposed to the environment in more than two languages.
BTW, from the viewpoints of some linguists Cantonese is not included as one of the dialects of Chinese language system, but another independent language and it is more highly-ranked than Mandarin in service sectors outside China.