What is your exact question? Am I correct that this lady cared for the MIL 12yrs ago?
Yes, its a bit odd to only get in touch now- ALL these years later! I'm a HCP, not a carer though, but do recall patients from many years ago. I have often wondered how did X get on, did they have other children, what happened to Florence etc. I've never contacted any though, nor their families!
I don't want to be suspicious, but was their any mention of this person being added to the will?
Maybe the ex said something nasty? Who knows?
If its really 12yrs on- I would think your partner would be best to say something vaguely like :
' Dear ....
Thank you for looking after dear mum back in 2010. It was a difficult time for us all, but mum appreciated your help at the time.
Best of luck in your next adventures/travels.
all the best/regards xxxx
He could add that you were sad to see her go, but without know exactly what the ex said- who knows???