I have 3 adults that are IMPOSSIBLE to buy for I'm hoping that mners can help
Person 1 : female, early 70's, retired, comfortably off so generally if they want/need something they'll just get it!
Items that aren't possible:
Clothes - fussy & weight fluctuates
Books - only likes certain authors & buys their books as soon as they're released
Make up/perfume/toiletries - can't use for medical reasons
Music/film - has all the DVDs, CDs of the stuff she likes already (see gets what they want when they want)
Tickets for shows etc - is a carer, cannot guarantee if they'd be free on specific dates if caree falls ill/is having bad day
Alcohol - teetotal
Food - diabetic
Jewellery - can't wear for medical reasons
Pens - not their thing really but done in the past and currently has a glut of lovely stationery
Purses/bags - again done for recent events they have plenty and not particularly their thing
Gloves/scarves - as above has hundreds as nobody ever knows what to bloody get her!
Person 2, male, early 70's, caree of person 1, bedridden due to ill health.
Pyjamas - always end up getting these & he's actually quite fussy so hard to find ones he likes
Books/films/music - concentration/memory/hearing pretty much gone so can no longer enjoy these.
Toiletries - medical reasons mean basically only uses prescribed stuff.
Alcohol - dry alcoholic
Food - diabetic
Stationery - same as person 1
I've been debating mugs for incapacitated people IF I could find a "fun" rather than just a practical one. Other than that I'm completely stumped!!
Person 3 late 60's, female, OK financially and not materialistic anyway.
Food - diabetic
Alcohol - teetotal
Make up/perfume/toiletries - as per person 1
Books - uses library as never reads more than once
Music/film - not into
Clothes - tricky as disabled and clothes have to work with certain issues plus fussy plus weight fluctuates
Jewellery - cannot wear
Bags/purses/hats/scarves - has tons as nobody ever knows what else to buy!!
Tickets - health fluctuates so again cannot guarantee availability, can vary greatly day to day
Harder every year to but for these people. And when I ask? "Oh I'm happy with just a card" 
Maddening!
So any Christmas mn geniuses out there?