Why there isn't a perfect fit:
* Place-based implies a connection to a specific location or setting.
* Cousin refers to a family relationship.
These are very different concepts.
Possible alternatives:
* Kin-related: This emphasizes the family connection, but doesn't directly relate to place.
* Regional: This describes something specific to a geographical area, which can be related to place-based.
* Local: Similar to regional, but with a stronger focus on the immediate area.
* Familial: This simply describes something related to family.
* Collateral: This describes a relative who is not in a direct line of descent, like a cousin.
To choose the best adjective, you need to consider the specific meaning you want to convey.
For example, if you're discussing a community that has strong ties to a particular location and many family connections, you might use "local" or "kin-related." If you're talking about the shared history of two cousins from the same town, "regional" or "familial" might be more appropriate.