I would not be surprised if some, if not all, of the families will sue. I don’t know how successful they would be. Normally for liability insurance to kick in, the policyholder has to be liable for the act. Maybe, as
@lmr said, they could allege faulty locks, inadequate lighting, etc, but I’m not sure it would meet the burden of proof needed for liability.
While I mentioned that insurance will likely pay for the clean up whether or not covered, that is under the property portion of the policy. The liability portion of the policy is what responds to lawsuits. Insurance companies don’t agree to pay those if there is not coverage and will usually defend them if they feel they aren’t liable, regardless of the publicity. One reason is, we are talking a lot more money for this type of claim than for the clean up and repairs. The owner of this house has multiple buildings so it is likely insured under a commercial policy. In that case, it wouldn’t be unusual for the limits to be $500,000. And on top of that, they may have an umbrella policy with limits $1 million plus.
All JMO, based on 20+ years handling insurance claims.