Jeb thinks he's the Lord's gift to America. His father, mother, and brother could all tell him something and it wouldn't matter because Jeb Bush was completely delusional and wrong to enter the race at all. Jeb Bush may seem soft spoken but he could decide one day and say "I can survive jumping off the Grand Canyon" and none of his family members could ever hope to dent his resolve to make his leap of doom.
I don't actually think he thinks this, and he was goaded into running by big donors and the party establishment. His heart clearly wasn't in it, and the low energy nature of his campaign showed that.
If that's true, it shows how horrible these donors really are. It's actually kinda worse.