Ruby on Rails

Folks,

Unless I'm being dumb I cannot find anything on Google search or in the Rails books on how to create a one-to-one polymorphic association
(as apposed to a one-to-many polymorphic association).  New to Rails so please forgive my ignorance. The situation is simple: I have the
following models/tables

- Person
generic concept (name, age, nationality, etc) which I want to attach polymorphically to concrete models suchs

- Staff
- Mother
- Farther
- Child
- etc

concrete class contain additional type specific information which I do not want nullable hence STI is not desirable
and would result in a sparse table.

If it matters this is for a charity.

Regards, Neil

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