Only check beforeDelete if direct deletion

I have an application built with CakePHP 1.3 with a model structure as follows:
Tenant hasMany Records (dependent => true)
Tenant hasMany Invoices (dependent => true)

An Invoice can have a reference to a Record which I represent as
Invoices belongsTo Records
so that fetching an Invoice will fetch the associated Record (if there is one)

In the Records model I have a beforeDelete method which checks that no Invoice references this record before deleting it.

This all works fine.  The potential problem I am considering is if I delete a Tenant it will cascade to delete all Records and Invoices associated with it.  Since I don't control the order in which the related models will be deleted it would be possible that the Records would be cascaded first and fail the beforeDelete method because of existing Invoices that reference the record ultimately failing the entire delete operation.  However, since the entire tenant is being deleted I do not want to enforce the constraint of not deleting a record if an invoice references it allowing the delete to complete regardless of the order that the associated models are deleted.

My questions are:
1. Do I have to worry about this?  I have not been able to produce the problem but it seems theoretically possible.
2. If I do have to worry about this scenario, is there a way to distinguish in the beforeDelete call whether this deleting is a direct deletion or a cascade from the Tenant deletion?  If I can do that then I would be able to add a condition to only enforce the constraint if this is a direct delete.
3. Is there a better way of representing this relationship that would not run into this problem?

Thanks

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