>Thanks for replying. What time is it now in Israel? It is 1am here in Pacific Northwest.
Here it is now 11:30am

The two potential parents in this case are exactly identical at this time. That is why there is a question. Whenever there is a choice, and I can find no obvious reason to go one direction, I wonder if there is a standard or reason I don't see. Both parent potentials are the custom class on different class hierarchy levels. The reason these identities exist is for future potential for specialization at the level that it is needed. TIA.

if the classes are identical - i'd suggest you eliminate one of them at this point - unless you know the will differ in the future.
if they will be different - then you can make your decision based on the future use, otherwise, as I've said delete one of them now - you can always branch the hierarchy at a later time (i.e. add a parent to a class move some of the code to the parent and then create a new subclass with new functionality)

Arnon