Terminology Question - Set Of Related Records In Multiple Tables

Terminology question:

Is there a term for a set of records related directly or indirectly by key
value in several tables? For example, a single invoice record and its line
item records -or- a single customer, the customer's orders, the order lines
for those orders, the customer's invoices, and the invoice lines for those
invoices.

I'm thinking the term might be graph, but I'm not at all certain of this.

Thanks,

Steve J