NC for this because could be quite outing.
Parent died mid 2019, sudden death, a complete shock to us all.
(We are in Scotland so not sure if that changes things).
In dealing with the aftermath a family member, we’ll call them grabby, contacted parents solicitor to find out what the contents of the will were! 
Solicitor shared this info with grabby, (parent who is still still very alive was not aware grabby was contacting the solicitor).
The information solicitor shared was that the house wasn’t being left to grabby, grabby immediately fell out with the entire family - actually went mental and behaved pretty viciously to surviving parent. This made an awful time a lot worse - months later it’s still very strained and can never be repaired.
My question is, should we make a complaint?
The solicitor has admitted all this by email to me and phoned grieving parent to apologise, (I asked them not to contact surviving parent as grieving and in no fit state, but solicitor did anyway, a fortnight after spouse died
).
If it is relevant the info was shared with grabby as they have mutual acquaintances and work in similar profession.
I’m annoyed at grabby so admit it’s likely crowding my judgement!
I realise the solicitor has apologised but surely if you pay thousands for a service they shouldn’t get away with this?
Sorry this is long!