Selecting related tables in the relationships graph
You can identify tables that have relationships to one or more tables. You can select a table and highlight its source table, or tables that have a 1-away relationship to it.
To identify related tables:
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For more information, see Working with the relationships graph
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Highlight tables that are based on the same source table
Related topics 
About the relationships graph
Relationships graph keyboard shortcuts (Windows)
Relationships graph keyboard shortcuts (Mac OS)