Jack's parents

'Edgar wasn't sure why Jack and Zephaniah had such a rocky relationship. Jack refused to talk about his father (and few creatures in Halloween town were old enough to remember Zephaniah III's reign as pumpkin king). Death had told him Zephaniah and Jack's mother had divorced when Jack was a lumpling and he became an alcoholic. Edgar filled in the blanks from there. Even still, it made edgar sad to know he would probably never meet his grandpa Zeph'
 
~As the Nightmare Continues