Answer:
Aggregation is by entity and by transactor. So the deposits to three separate entities don't get aggregated unless they are made by a common transactor. The same reasoning gets applied to the second scenario. If multiple deposits are made by one transactor, aggregate them regardless of who owns the accounts. If multiple deposits are made to the same account, aggregate them regardless of who made the deposits.
First published on BankersOnline.com 7/24/06