Legal Question in Wills and Trusts in California

I am not sure what you are really asking. If a Probate was opened for your grandfather's estate, then the Probate Court is going to focus on heirs named in the will regardless of whether they are a blood relative. If there was no will then perhaps you fall into a class of beneficiaries entitled to some portion of the estate pursuant to the laws of intestate succession or if there is a gift in the will to a class of beneficiaries (i.e., grandchildren) then you will need to establish your standing. One other possibility is if you are the successor to a beneficiary and entitled to receive as the issue of a deceased named beneficiary. You should meet with a lawyer to go over the specifics of your grandfather's estate.