I guess for people who trade in shares and have the knowledge of the correct forms to fill out at their fingertips, this may very well be "easy peasy".. don't know about the correct "asset declaration" forms..
People who trade in shares are no different than those who stick their money in deposits, we're just a bit more proactive, even at my age of 84. There are no "correct" reporting forms. You simply tell 'em in writing or over the phone.
don't have that back-up family to lean on..
that is what I am talking about.. for those people it is not so easy peasy...
If those folks can't communicate by phone, have no family assistance, and can't walk to the post box then they should be in a different sort of accommodation.
Anyway, I don't want to do battle with you over elder-care. That's pointless.
I wish you and your Mother well.