Flashforward Question!

A question! In a flash-forward, Jack was back from the island, he was drinking and taking pills and was back at the hospital checking on the woman he had saved from the burning car, while he was thinking about jumping off a bridge. Anyway, another doctor told Jack to go home because he knew Jack had been drinking but as Jack started to leave he turned back and said, "You go and find my father and if I'm drunker than him I'll leave!" Or words to that effect. Now, my question is, wasn't his father already dead? It was after he got back right? Or have I totally misunderstood what was going on? Just wondering!

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