No one is going to be able to answer your puzzle unless you lay out the specifics. But if there are truly six minors, all with the same custodian, and the custodiam made three $2,000 cash deposits and another party (not the custodian, not any of the minors) made three separate $2,000 cash deposits, and each of the cash deposits went into a different one of the six minor's account -- If that describes the scenario, I don't think you have a CTR.
You have two transactors, each of whom did $6,000 in transactions. And you have six beneficiaries, each of whom benefited from $2000 in deposits. The custodian has no benefit from any of the transactions, since he doesn't own the accounts.
So no one party benefited from or transacted more than $10000 in cash transactions.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8