I think Bill is very sick. Not a normal reaction.
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That’s pretty common for a lot of the older people that had major heart surgery. There brain is never the same, and I have no idea why?
Maybe someone that has more medical knowledge can chime in.
Look at how Chelsea hugs Hillary. She puts her arms around her mom, then locks her fingers together in the back, not touching her back. Either she really can’t stand to touch Hillary, or Hillary wears some sort of medical device that Chelsea doesn’t want to squish with a hug.