The Memberships Report (Fulfilment Reports > Memberships Report, /admin/reports/accountmembers) shows parent accounts and the member accounts linked to them. Each parent is a collapsible panel titled Parent name (member count | combined subscription price of the members), containing a table of members with ID (link to the customer), Name, Subscription (#id, plan group – plan name, linked) and Rate (the subscription price), or No active subscription. It has no date filter and uses each person's most recent subscription. If no parent accounts have members yet you see "No account members".