What is fair game for AA/CC suits?

If someone has assets where they are the custodian for a child, are those assets at risk in an AA/CC suit? I have a friend who might be sued but they don’t have much in their own name aside from a 401k. They do, however, have stocks and investment accounts in their children’s names where she is the custodian of their accounts. She is planning to use this for their college. Are these accounts at risk?

The children’s accounts belong to the children and are not subject to judgment.