I'm going to ask a different question. Suing? Isn't this a criminal matter? The family wants money? What?
Criminal offense can and often does lead to civil action as well. It's actually pretty common to sue the party responsible for you being victimized.
So, say you called a utilty company about an issue.
And the company sens someone out. Maybe a direct hire or maybe a private contractor, it makes no difference, and while they are at your home one or more of the service people commits a crime against you or your family. Theft, violence, sexual assualt. Whatever.
You think the utility company bears no responsibility for failing to ensure that the person that they sent to go INTO YOUR HOME was a decent, respectable person and not a known criminal or allowing known criminals to tag along?
This guy was a known criminal. Whether he volunteers the information to you (Hi! I'm a pederast. Where's the satellite box?) or not people that you send on your behalf in a professional capacity are your responsibility.
The company is responsible for its' representatives.