Webjack hanna’s family shared an update amid the famed zookeeper’s battle with alzheimer’s. Hanna was diagnosed with the neurological disease, which erodes. Webtwo years ago, jack hanna's family revealed that the beloved wildlife expert had been diagnosed with alzheimer's. Now, they're speaking openly about the state of. Webthree years after being diagnosed with alzheimer’s, beloved zookeeper jack hanna’s family is sharing an update on his condition. While talking with people, hanna’s family.