There intestate succession if found in the Probate Code 6402. It goes to issue, parents, then issue of the parents... As a grandchild you are considered issue and would be first in line... If her child had children there is a right if representation... Probate is complicated enough you should hire a probate attorney work through this for you to make sure this is done correctly
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I am sorry for all of your recent losses. Attorney Green has provided you with a solid answer. Assuming your grandmother did not have a will, it appears that you and your sister are first in line as heirs. Please retain an experienced estate administration lawyer to provide assistance. Good luck to you.
This information is presented as a public service. It should not be construed to be formal legal advice nor considered to be the formation of a lawyer/client relationship. I am licensed in Connecticut and New York and my answers are based upon the law in those jurisdictions. My answer to any specific question would likely be different if I were to review a client's file and have the opportunity to interview the client. Accordingly, I strongly urge you to retain an attorney in your jurisdiction with respect to any legal matter.