My mum's partner is terminally ill. Has a few weeks at most left 
My mum is caring for him at home. My mum and her sister lost their youngest sister when they were young and are big believers in the spiritual side of things and have found great comfort in finding white feathers in the past as a sign things will be ok.
I visit my mum and her partner every day and talk on the phone every night to make sure she's doing ok as can be. I feel like leaving a white feather for her to find will give her a little bit of comfort at a time when she does really need it. Would it be wrong to 'plant' a white feather in her room one day and let her believe it's sent to her from her sister who passed (or an angel or spirit etc) .