Where did the decedent live? I assume California.
Was the decedent married? If so, was there any separate property?
If the decedent was not married, let's divide the assets you are concerned with into two lists:
the first contains assets title to which can be cleared by contract terms, such as by a surviving joint tenant, a pay on death beneficiary, or a life insurance beneficiary.
the second contains assets in the decedent's name alone.
If the assets in the second list are worth over 100k, then it looks like one of the heirs at law will need to open a probate.