My Grandson is 10. His mother has a brain tumour and is steadily declining and loses use of limbs and reasoning skills from time to time : They live in tier 4.
My son lives with me in tier 2.
My wife is on Chemotherapy and waiting for an operation for which she must stay Covid free. The Chemo' has reduced her immune system to almost nil: She lives in tier 4.
Grandson's mother is going through a difficult patch and wants Grandson to stay here for Christmas. But that's not allowed.
Having suffered from pleurisy in 2016 and double pneumonia in 2012 my GP says I must not catch this virus as my lungs are already weak. I have no wish to catch the virus from the germ factory a.k.a. my Grandson so I could go and stay with my wife, but that's not allowed.
None of this has anything to do with Christmas which just happens to be my least favourite time of the year.

OK then that's my bit of moaning done for now.