摘要：Many times the development of the era has an impact on the loss of traditions, genetic relationship systems, and customs. Because things that are traditional are always considered as obstacles to progress. This research reveals the deviations and changes in genetic relationship in the Batak Toba community in the perspective of modernity. Data collection in this study uses a literature review approach. Many data sources are taken from various books, journals, and other sources related to deviations or changes in the genetic relationship system of the Batak Toba community in the perspective of modernity. After that there will be an evaluation, content analysis and criticism of the sources until the latest findings are obtained. The conclusion of the research is that socio-cultural changes in the second and third generation of Batak Toba people overseas tend to bring destructive changes, so that they no longer know the origin and genetic relationship system. This has led to a culture and identity crisis that in the end they no longer know the customs of the na tolu, ancestors and their origins.
