When two accounts are connected with a Household Relationship, one account is set as the Primary (or Head of Household) and the other is set as the Member:
When running a report that lists the primary accounts, the HH Member Name field can be added to show the name of the account that is the member of the household relationship. However, when this field is added to the report it is not displaying the member account's name.
In order to display the name of the member of a household in a report, the query used to run the report must actually contain the member account. If the query only returns the head of household accounts, the HH Member Name field will be blank on the report.
In order to see the names of both members of a household, a custom relationship report can be created. For more information on how to create and run this type of report, please review the Run a custom relationship report guide.