Multiple Inlines for a ModelAdmin

admin.py

from momme.forms import ListingInline, LifeStageInline, FranchiseInline

class MommeArticleModelAdmin(admin.ModelAdmin):
    " Custom model admin for Articles to separate out LifeStages, Franchises and SubCategories. "
    inlines = [
        ListingInline,
        LifeStageInline,
        FranchiseInline
    ]
admin.register(Article, MommeArticleModelAdmin)

forms.py

lifestage_category = Category.objects.get(title='LifeStage')
class LifeStageForm(ListingForm):
    category = forms.ModelChoiceField(
        queryset=Category.objects.filter(tree_parent=lifestage_category)
    )

franchise_category = Category.objects.get(title='Franchise')
class FranchiseForm(ListingForm):
    category = forms.ModelChoiceField(
        queryset=Category.objects.filter(tree_parent=franchise_category)
    )

class ListingForm(ListingForm):
    category = forms.ModelChoiceField(
        queryset=Category.objects.exclude(tree_parent=franchise_category).exclude(tree_parent=lifestage_category)
    )

class LifeStageInline(admin.StackedInline):
    " Listing Inline for Life Stage assignment in Distillery. "
    verbose_name_plural = 'Life Stages'
    model = Listing
    extra = 0
    form = LifeStageForm
    template = 'ella/listings/listing_item_inline.html'

class FranchiseInline(admin.StackedInline):
    " Listing Inline for Franchise assignment in Distillery. "
    verbose_name_plural = 'Franchises'
    model = Listing
    extra = 0
    form = FranchiseForm
    template = 'ella/listings/listing_item_inline.html'

class ListingInline(admin.StackedInline):
    " Listing Inline for Sub Category assignment in Distillery. "
    verbose_name_plural = 'Listings'
    model = Listing
    extra = 0
    form = ListingForm
    template = 'ella/listings/listing_item_inline.html'