It is true.

Your inherited IRA should be registered in your name and your mom’s name. This would show that you inherited the IRA from your mom.
The IRS requires that both the decedent and beneficiary names are included in the account registration for inherited IRAs. This allows them to identify the person from whom you inherited the IRA and helps the custodian or trustee of your inherited IRA to meet IRS compliance requirements for tax reporting.

When you are consulting with your tax advisor regarding the distribution requirements for your inherited IRA to let him or her know that you are a successor beneficiary. Being a successor beneficiary means that you did not inherit the IRA from the owner, and your distribution requirements might be different from those that apply to your mom. See Can a successor beneficiary take distributions over his life expectancy?