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>The reason for adding the method to the parent isn't just the convenience of having it there, but the notion that if both children need it, it must logically belong to the parent.
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Tamar,

In .NET, every class inherits from System.Object. Obviously, the System.Object class does not contain stubs for every method in each class that inherits from it. From a desing standpoint, how is this situation different?

I guess I'm going under the premise that there might be a third child someday that may not need that method....