Who do I call to see whether my granddad left CDs for me as well as my sibling? He died in 2018 however called my mom in a matter of seconds prior and said he had CDs for us.

Who do I call to see whether my granddad left CDs for me as well as my sibling? He died in 2018 however called my mom in a matter of seconds prior and said he had CDs for us. I've gone after throughout the previous few years to reach out to my grandma(she was my progression grandmother) yet she disregards my calls. I was told I could call and check yet the individual who let me know wasn't excessively certain on who to call.