This is found with the Excel Exports in the toolbar. It was designed to be used for a church directory where you would need the names of all the members of families. This can be used for a mail merge.
It contains the following fields:
NOTE: You can also use the Excel Export and select the Family Members option for the output. This contains a column named Family Name which is the last name of the Head of Household. If you sort by Family Name first and then by Family ID, you will have one line per family and the family members will sort together even when there is a blended family in which the members have different last names.