neo4django warning: expected behaviour?

gistfile1.py

from neo4django.db import models



class Person(models.NodeModel):
    name = models.StringProperty()
    born = models.DateTimeProperty()
    died = models.DateTimeProperty()
    sex = models.StringProperty()
    
    friends = models.Relationship('self',rel_type='friends_with')

#--------

class Evidence(models.NodeModel):
    id = models.IntegerProperty()
    name = models.StringProperty()
    as_of = models.DateTimeProperty()
    
    families = models.Relationship('Family',rel_type='FAMILY',related_name='evidence')
    persons = models.Relationship('Person',rel_type='PERSON',related_name='evidence')
    next = models.Relationship('Evidence',rel_type='NEXT',related_name='prev')

class Family(models.NodeModel):
    status = models.StringProperty() # married, etc.
    
    spouses = models.Relationship('Person',rel_type='SPOUSE',related_name='families')
    children = models.Relationship('Person',rel_type='CHILD',related_name='families')

I'm not sure why I get this warning; it might well be that I do not completely comprehend the related_name concept, but I thought having different rel_types would make the above model not ambiguous/conflicting...

I get the following warnings in neo4django:

>>> from evidences.models import *
/[...]/neo4django/db/models/relationships.py:180: UserWarning: `evidence` and `evidence` share a relationship type and direction. Is this what you meant to do?
  % (r.name, name))
/[...]/neo4django/db/models/relationships.py:180: UserWarning: `families` and `families` share a relationship type and direction. Is this what you meant to do?
  % (r.name, name))