This article explores research and practice on the holistic benefits of education for language revitalisation and reclamation -- ELR[superscript 2] -- efforts that link home, school, and community in mutually supportive language work informed by a critical understanding of coloniality as the root cause of language endangerment. The article examines ELR[superscript 2] in and out of school, asking what can be learned from these projects in light of their combined aims of language revitalisation and education parity and the broader goals of promoting cultural knowledge, identity, and continuance; strengthening intergenerational family and community ties; and anticolonialism, sovereignty, and self-determination. In pursuing these goals, ELR[superscript 2] also recovers Indigenous practices of mutuality, relationality, respect, and equality -- supportive factors in individual and collective wellbeing. As a pathway to these holistic outcomes, ELR[superscript 2] holds the promise of sustainable diversity and social justice for all.