Buying for adult grandchildren

I give to adult children at birthdays and Xmas around £100 per gift …..two grandkids only 11 and 16 and they get about the same spent on them for their Xmas and birthdays.
Also send £20 per month pocket money to both g/kids via ‘Go Henry’….. git enough to last if major catastrophe like roof blowing off!! Well insured anyway for damage. I live alone ….pay my husbands care bill of £1,000 a month ( subsidised )…and live frugally! No holidays. What else you gonna do with it!?

I give my 2DS money, and presents to DD to the value of £100 each for birthdays and Xmas. Plus a bottle of wine or spirits for Xmas and tin of biscuits and tin of chocolates.
3DGC get money for the 2 eldest (15 and 12) and presents for youngest aged 7, £60 each for Xmas and birthday unless they ask for something for a present.
I used to buy presents for the whole family 18 adults and children, sisters, nieces, nephew, great neices and nephews each Xmas when I was working but since retirement and moving to Devon I can't afford this anymore. Most of them never even bothered to say thanks or send a card anyway.