<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def relationship(self):
 """ Retrieve what the relationship between the user and then authenticated user is. """

        r = requests.get(
            "https://kippt.com/api/users/%s/relationship" % (self.id),
            headers=self.kippt.header
        )
        return (r.json())