I had POA for my mother until her passing. She had stocks and wanted to leave them to her children and child of late husband; there is one person listed in will not on this list. I was in process of getting them transferred and had a list of those getting stocks stating " I want to leave these to the following," had discussed with bank about what to do and had gotten necessary forms.She had me sign form and initial. Is this considered holistic? Is my signature for her legit, it was done before her passing?