One of the definitions of Demise is the end or failure of something (like a business, industry or system) or the death of someone that was considered to be powerful. So, a synonym for demise is "destruction," "death" or "passing". And since the excerpt is telling how the Ledstone's grandfather, who was a notorious bootlegger that killed many people, ended up being killed in a shoot-out, the sensational "demise" refers to the sensational "passing" of Ledstone's grandfather.
I think it's going to say like how the characters are feeling right now and how they talking like for example when your angry you talk in a angry voice and
Their is your answer the term her would not make any sense in this sentence but their would because asking did either of the sisters bring their umbrella and the term their belongs to both of the sisters