We are not able to export information that does not exist on the relationship record on the constituent's record that is included in the query.

For example, if we have a query of parents that have children recorded as individual relationships on the relationship tab, a user may want to export the name, address and attributes of those individual relationships. However, if the attributes that they are looking for are actually recorded on the children's constituent record and not the children's relationship record, we will not be able to export them from this query. In this situation, we will only be able to export information about the children that is recorded on the relationship record itself.

Alternative solution:
Query on the children and export information about the parents that exists on the relationship records on the relationship tab of the children's constituent records.