Coverage for Auto Incident with Parked Car Under Homeowner's and Auto Policy

Our insured had a son that did not live at home. The son brought his uninsured auto to our insured's home to work on it. The car slipped off of the son's car jack while in our insured's garage and the son was killed. We filed a claim under our insured's ISO form homeowner's policy for a liability claim by the son's estate. I feel that there is coverage under the homeowner's policy. I feel that there would also be liability coverage for our insured under his own auto policy (which we do not write) for a liability claim if they have a standard ISO policy form. Do you agree that there is coverage under both the ISO homeowners and the ISO auto policies?

Pennsylvania Subscriber