[john70t]

Not an attorney but I think everything goes into trust before you pass, or else it ends up in government probate court which takes years to settle here in the states.
So you change your property deed from personal names into "granddaughter trust" or "house trust" or whatever random name you use on public records.
The details should remain private that way.
The bank accounts numbers amounts should be spelled out in the Trust documents, as well as conditions for withdraw or changes by any person.
The compensation and/or limitations of the Trustee can be spelled out, or nedd for second opinion and what happens then, as well as conditions for his/her removal and a secondary backup such as a bank officer even can serve.
You can write it all out and have the attorney polish it to local laws.

(I think that is the way it works.YMMV)