If there's only two relatives, as in your example, use two to-one
relationships.
If there's an indeterminate number, you can add an intermediate
"joiner" entity, as explained here:
http://www.cocoabuilder.com/archive/message/cocoa/2007/9/16/189293
The above joins between two different entities, so you'll modify it to
join the same entity. All data modelling situations are a little
different.
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