A Family Trust was made in 1996, with a Power of Attorney. In 2006 a Durable Power of Attorney was made by a Norary Public, which one is valid?

Do you need Calfornia residency to have power of attorney/trustee in California?
My mother lives in California and I live in Virginia, which makes the situation difficult. My mom has given my sister tens of thousands of dollars for many reasons and my sister continues to stall and not pay her back. My sister told my mom that she sued the Social Security Ad. and was awarded $400,000 but my sister’s lawyers are holding the money. That was the story last year. Now the new story is that the bank is holding the check. I know my sister is misrepresenting the truth and now she has convinced my mom to open a bank account at her bank. Is it possible for my sister to access my mom’s account? In addition my sister has durable power of attorney for both financial and health reasons, which is a big concern because of all the money she owes my mom. What actions do I have avaible to get my sister to pay back my mom and can I be made power of attorney and trustee if I live in Virginia and my mom lives in California?
Thank you,
A concerned son

durable power of attorney
My son in incarcerated in Siskiyou Co. and will also face charges in Sacramento when he has completed his sentence in Siskiyou. I live in Kentucky. I need to be able to handle his financial affairs while he is incarcerated. I need access to his checking account in California. Do I use a California form or a Kentucky form. Do I need to have it notarized both in Kentucky and in California?