I used =count(*) in a field in the report header to display the number of records in the report. But how do I also display the total number of child records in the report?

Report is based on parent table "attendees".
There is a child table that contains the guests, if any, of each attendee.
I've got the main report created, the sub-report for guests imbedded in it. All that works fine, but I want to summerize, in the report header, the number of attendees, the total number of guests, and the grand total (attendees + guests).