if you want to query pages, then just query for the Page class
explicitly:
session.query(Page).select(<criterion>)
the relations on a parent class are not used for selective querying.
if there is a particular "filtered view" you will need often, you
might also want to add special properties to the Website class:
class Website(object):
filtered_pages = property(lambda self:[p for p in self.pages
where p.someproperty==somecriterion])
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