The brother couldn't get the door opened so immediately called the police? That makes no sense. Who, if that concerned, wouldn't break a window or bash in the door?
It actually doesn't surprise me they waited for "authorities";and in this case it might have added unneeded issues to a crime investigation.
Can we "safely" assume the murdered family had no firearms to defend their lives ?
Isn't it ironic that the authorities insist on smoke detectors and recommend fire extinguishers but are terribly hostile to families having a real "life preserver" ?