Exactly what revenge will a 50 year old woman dish out to you? Are you not capable of looking after yourself, and/or getting the police involved if, on the odd chance, something were to happen? What do you think will happen to you if she tells the police you tried to blackmail her out of £10k?I never thought about money but friends just hated what woman did but friends told me it's a waste of time putting neck on line for nothing. There might be revenge.
On a different note, how about checking if nephew even got his money? Give him a call or would it be impossible if he's in will for inheritance woman to not give it to him?
It sounds like an excuse. Just do the decent thing, either go to court to help the dead ladies relatives get what is due or just walk away.