To associate an adult record with that of a child's record in your directory...
1. Navigate to the profile of the child
2. Use the tabs to go to his/her "Relation's View"
3. Use the "+ADD" button to search for an adult's records to link with the child. If the adult doesn't yet have a record you can create it using the "+ Add new user" button.
Use the "Relations" tab to see adults currently linked to the child in the directory.
Search for an adult to add to the child's record or use the "+ Add new user" button to create a record for an adult that is not yet in your directory and add that adult as a relative of the child's.