As nereo and others stated....very easy to make the switch. And if your parents balk at going to Vanguard, simply just show them the math.
They are currently paying 1% AUM fee....$2400 and probably some other fees that EJ is not legally responsible for disclosing. Assuming they go with Vanguard Personal Advisor Services (PAS) who will manage their money, that fee is 30 basis points (.3%), which will cost them $720, a savings of $1680 the first year, and even more in subsequent years as the account value grows. This is a no brainer....you're making the right call. Good luck.