Catching up a bit here...
Grandpa on Ma's side was known to sneak a plug of chew out in the barn ~ only thing is gramps was a good Mormon.
Grandma and Grandpa also drank coffee

another no-no.
Can't say anything for gramps on pa's side as he died when pa was eleven.
As far as rhubarb, one of my favorite childhood memories is grabbing the salt shaker and heading out to the garden to grab a fresh stock, pealing it, salting it and eating it.