Funny reply but simpler: today's banks with basic changes in authentication and limits on each party doing a charge in amount or timing. Would deal with parent's concern. Maybe add whitelisting, too, if people just wanted to use their main accounts for certain stores or bills. Just one extra transaction in a traditional database with some simple COBOL. Not much work.
Note: Brian Krebs recommended the same thing as a barrier to ACH fraud where the recipients were whitelisted with maybe in-person, strong-auth registration.
Note: Brian Krebs recommended the same thing as a barrier to ACH fraud where the recipients were whitelisted with maybe in-person, strong-auth registration.