What do you mean by "their own accounts"? We just had to go through this this year, and every bit of information we were able to find, from IRS Publication 590, to documents from the brokers involved, all very clearly and explicitly stated that the named non-spouse beneficiary of an IRA cannot move or roll over the funds into their own IRA. The beneficiary either has to leave it in the financial institution that the decedent's IRA was at, or else open a special Inherited IRA account at the custodian of the beneficiary's choice and fund that Inherited IRA via a trustee-to-trustee transfer.
-- Rich