There are a myriad of synonyms that can be used for the phrase "is family." One such synonym is "blood relation," which implies a genetic connection between individuals. Another synonym is "kin," which refers to people who are related by birth or marriage. "Clan" and "tribe" can also be used to describe a group of people who are related to each other, suggesting a sense of community or solidarity. "Household" is another word that can be used to describe a family unit, while "lineage" and "ancestry" point to the historical and genealogical roots of a family. Ultimately, the synonyms for "is family" reflect the many facets of what it means to belong to a group of people with whom one shares a deep connection.