Inherited manytomany field not showing up in django shell

I am working on blog application. I have made class "GenericBlog",
which I am inheriting to a class Blog.There is a manytomany field in
the GenericBlog class called "sites".

The problem in this that when I try to create an object of "Blog", in
the django shell, it gives an error "sites si an invalid keyword".

I would be very grateful, if you can help me with a possible solution
to this problem

Kabir

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