Condolences, tanith 
I think it's understandable that your sister is reluctant to go, it's a long drive and she is 81. Driving really is not a pleasure now, particularly on motorways.
It would be perfectly all right, imo, for her to telephone or write to your sister-in-law and explain, which I am sure she will do.
You will be there to represent that side of the family too.
Daniel “Tommo” Thomas charged, no bail.
Has anybody cut down on their meds after reading about over prescribing
This sounds awful … Elderly lady euthanised against her will in Canada


