2. If you don't apply for notarization (I think those people talk nonsense and have nothing to do, not to solve the problem for you, but to find something for yourself), go to the above-mentioned unit window to handle this problem, including your ID card (entrusted agent), your mother's ID card (entrusted agent) and your household registration book. These three things can prove the kinship of your family, and you should be able to handle bank deposits (fixed deposit books, entrusted agents) in the bank, as well as stocks and funds. If the window asks you to provide more other proof materials, you can ask a lawyer to issue a legal letter to prove it, or you can have a mother's death certificate. I hope your family didn't change the name of the household registration book so soon, otherwise it would be really troublesome. If you need a certificate issued by the police station, you need to bring the original certificate of the police station to the window of each handling unit and leave the original or copy according to the requirements of the handling unit. So you have many ways to deal with it, and you don't need any notarization that is not troublesome enough.
If it is not enough for you to take these things or refuse them, you can handle them with the death certificate and household registration certificate of the police station. This one is more useful than others, which is recognized by many units. For example, if you lose your ID card, you can go to the bank to cancel your account, withdraw money or report the loss as long as you have the certificate from the police station and write down your name and ID number. If I lose my ID card, I will take the police station certificate to handle the banking business, which has the same effect as the ID card.
I hope you can deal with these troubles as soon as possible and get out of your own sky!
Good people are safe all their lives!