Heritage language speakers often feel discouraged from using their heritage language because they are told they don't speak it well. This book offsets such views by investigating heritage language variation and change across generations, in eight languages spoken in Toronto. It introduces new methodology to help readers understand and apply variationist sociolinguistic approaches to quantitatively analyze spontaneous speech. This approach, based on a corpus of 400+ speakers, shows that variation and change across the grammar of heritage languages resembles the patterns in hegemonic majority languages, contrasting with the simplification/attrition patterns in experimental heritage language studies. Chapters compare patterns across generations, across languages, across ten variables in Cantonese, and between indexical and non-indexical patterns. Heritage language speakers are quoted, showing that this research increases heritage language usage and pride. Providing a tool for language revitalization, it is essential reading for anyone interested in learning about and/or conducting research on heritage languages.