yes it’s bad news but can’t help thinking about why you say life is unfair.
I can't help feeling that if you had children with an inherited illness which denied you grandchildren, had lost your husband fairly recently and now were told that somebody close to you had terminal cancer, you might feel that life was unfair. Don't we all feel like that sometimes? And probably with less good reason!
It is difficult to advise you about what you can do without knowing what treatment is on offer or how much pain your BIL is in. If they are reasonable symptom free, I would urge them to live their lives to the fullest so that they have the most wonderful memories to look back on in tough times. I would offer my help in anyway they needed but without being over fussy. I think you can only take your lead from them.
Ah dear - why does getting older equate to dimished brain power?
Quik question (daughter w new baby)
Mega dinghies transport 230 migrants in one go. 80,000 arrived under Labour.
tell them how you feel, that you're sorry and don't know what else to say. That allows them to talk to you about it if they need too, either together or individually.
On approaching his own death Billy Graham once said, "You cannot count your days, but you can make your days count"