Django admin - Edit parent model and related models on the same page

I want to be able to edit all data on one page. How can i achieve
this ? Should i modify my models? If so, then how should i modify
them?

class TextStyle(models.Model):
color = models.CharField(_("color"), max_length=7)
style = models.CharField(_("style"), max_length=30)
typeface = models.CharField(_("typeface"), max_length=100)

class GenericText(models.Model):
text = models.TextField(_("text"))
lines = models.IntegerField(_("number of lines"))
style = models.ForeignKey(TextStyle, verbose_name=_('text style'),
blank=False)

class ExpirationDate(models.Model):
date = models.DateField(_("date"))
style = models.ForeignKey(TextStyle, verbose_name=_('text style'),
blank=False)

class Coupon(models.Model):
name = models.CharField(_("name"), max_length=100)
slug = AutoSlugField(populate_from="title")
background = models.ImageField(upload_to="userbackgrounds")
layout = models.ForeignKey(Layout, verbose_name=("layout"),
blank=False)
logo = models.ImageField(upload_to="logos")
title = models.OneToOneField(GenericText, verbose_name=("title"),
blank=False, related_name="coupon_by_title")
body = models.OneToOneField(GenericText, verbose_name=("body"),
blank=False, related_name="coupon_by_body")
disclaimer = models.OneToOneField(GenericText,
verbose_name=("disclaimer"), blank=False,
related_name="coupon_by_disclaimer")
promo_code = models.OneToOneField(GenericText,
verbose_name=("promo code"), blank=False,
related_name="coupon_by_promo")
bar_code = models.OneToOneField(BarCode, verbose_name=("barcode"),
blank=False, related_name="coupon_by_barcode")
expiration = models.OneToOneField(ExpirationDate,
verbose_name=("expiration date"), blank=False,
related_name="coupon_by_expiration")
is_template = models.BooleanField( verbose_name=("is a
template"), )
category = models.ForeignKey(Category, verbose_name=("category"),
blank=True,null=True, related_name="coupons")
user = models.ForeignKey(User, verbose_name=("user"), blank=False)

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