Programmer - NHibernate mapping of one class containing 2 references to the same entity

Programmer Question

I have a person class, then have a family class where I have a property Father and a property Mother of type Person.

I have a database table for Person and a Family table containing FamilyId, FatherId, MotherId where FatherId and MotherId is foreign keys for PersonId in Person table.

How would you go about to map this in NHibernate?

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