No FK on abstract base class

fkonabstract

This is a contrived example that illustrates my problem.  I want to subclass a base class (PersonBase) 
into several different descendant classes.  Each person type can have multiple emails and phone numbers

The email and phone class should have a 1..n relationship to all the different people subclasses.

I thought could structure this as follows, but the FK cannot be created on the abstract base class.  What 
is the best practice for solving this situation . . . instantiate that base model instead of making it 
abstract?  Or try to implement GenericForeignKeys, or do they introduce more problems than they solve?  
Here's the problem in pseudocode . . .

class PersonBase(models.Model):
    first = models.CharField(max_length=80)
    middle = models.CharField(blank=True, max_length=80)
    last = models.CharField(max_length=80)
    suffix = models.CharField(blank=True, max_length=10)

  class Meta:
     abstract = True


class Family(PersonBase):
  relationship = field.choice(father, son, mother, daughter . . .)


class Advisor(PersonBase):
  relationship = field.choice(professor, mentor, tutor. . . )


class Email(models.Model):
   person = ForeignKey(PersonBase)  <== CAN'T DO THIS, THE BASE IS NEVER CREATED IN THE DB
   emailtype = field.choice(personal, work, shared)
   email_address = field.emailfield()


class Phone(models.Model):
   person = models.ForeignKey(PersonBase)  <== CAN'T DO THIS, THE BASE IS NEVER CREATED IN THE DB
   phonetype = field.choice(cell, work, home)
   number = field.phonefield()