You want to implement family customer accounts in SAP Customer Data Platform.

The SAP Customer Data Platform supports the implementation of family customer accounts through the use of groups and relationships. This approach allows for the creation of a unified view of customer contacts, associated accounts, and the relationships within these accounts. By leveraging this structure, organizations can gain enriched, real-time insights into their customer base, which is essential for driving growth and providing a customer-centric experience.

References = This information is corroborated by the SAP Community article discussing the use of the SAP Customer Data Platform for B2B use cases, which outlines the importance of understanding customer relationships and the benefits of having actionable data1.