This is really something that can be asked with relation to both schema and desired object model.
In general, NHibernate doesn't support loading a single object from multiply tables, although it can be simulated using joined classes.
Hibernate does have this feature, and it would arrive to NHibernate eventually.
It is currently not planned for the 1.2 release, though.
If it is important to you, feel free to port the functionality from Hibernate (a non trivial task, I must warn you) and submit a patch.
At any rate, open a JIRA issue for it (although one may already exists).
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