I don't want to rain on your attorney's parade, PStalfort, but I don't think that an agent can appoint a subagent without the express approval of the principal. In other words, I don't think your debit card provision will stand up in court. But I am not an attorney, and will defer to someone who is with a different opinion.
Did Momma benefit in any way from wayward daughter #2's purchases at the department store or restaurant? If not, I think you're stuck with refunding those transactions if Momma files the claim with you. You may or may not be able to wring the money back out of her daughter.
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John S. Burnett
BankersOnline.com
Fighting for Compliance since 1976
Bankers' Threads User #8