When selecting fields in an export for relationships, it is possible to select an order by for these fields to sort the results.
In the output of an export, you can select to sort your results. You can select to order in ascending or descending order.
Examples of sort options:
Last Name First Name Contact Name Date Added Age Birth date Relationship Sort Key
In the Criteria window, you will be prompted to select the number of relationships to export for each constituent. In the bottom right of the window, click the drop down menu for Order By. Select the field to sort by. When you export the data the relationships will be sorted as selected.