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Jesica ,
As Ned remarked there are many types of tree data structures. The Composite pattern chapter in The Design Patterns Smalltalk Companion book provides some additional insights. Hierarchical and EToyTextNode have explicit parent-child structures as does Morph though it uses subMorph terminology.
Also, take a look at the FreeDOM class in Morphic Joules
http://minnow.cc.gatech.edu/squeak/1968
It provides a flexible implementation of the Composite pattern which you can quickly put to use in representing many of these different types of hierarchies.
-Laurence
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