Answer:
Each account seperately.
Step-by-step explanation:
Securities Investor Protection Corporation (SIPC) is a non governmental organisation that is mandated with protecting clients is brokerage firms that become bankrupt.
SIPC provides coverage of up to $500,000 for cash and securities.
SIPC coverage is applied per customer name, so John Jone's individual cash account, the joint margin account with his wife, the custodial account for his minor daughter, and custodial account for his minor son will be covered seperately.