The family was originally told to stay at home after their older daughter -- who returned from Italy -- contacted public health officials to report having symptoms of the fast-spreading virus on Thursday. She had been self quarantining herself at home with her parents who were not showing symptoms. She went to a hospital on Friday and tested "presumptively positive" on Saturday.
The family was told to stay at home, but the father brushed aside instructions by the state's health department, according to County Executive Sam Page.
They reportedly didn't learn of the diagnosis until after they were at the dance and left immediately.
After going to the dance, Page said officials told the man on Sunday that "he must remain in his home or they will issue a formal quarantine that will require him and the rest of his family to stay in their home by the force of law."