Were both of Chris’s parents hoarders?
We know Barb is, the jury is still out on Bob. Personally, I don't think Bob was a hoarder, at least not in the sense that Barb is.
Yes. Both Bob and Barb were compulsive hoaders, though Bob rationalized his as a result of a childhood spent in poverty. Barb was also pretty poor growing up AFAIK, but she had to manipulate her way into the arms of sugar daddies to claw her way out— the fucking rube that she is. Bob has the excuse of at least working for what he had. I could give a fuck if Barb’s shit was put toward Chris’s expenses (read: frivolities), but Bob’s stuff meant something to him.
Based on what we know about him, Bob doesn't really strike me as a clinical hoarder. If Bob had any hoarding behaviors, they were a lot less severe than Barb's. It's likely that Bob was just a collector and not a clinical compulsive hoarder, but Barb is most certainly a hoarder.
Bob did have a vast record collection, but he actually did his best to take care of his records (while still being able to enjoy them) unlike most hoarders, who simply gather whatever objects they are fixed on (food, animals, random trinkets) and hold onto them for the sake of owning them.
Bob tried to clean up the hoard many times, but Barb always threw a fit and would not let him. That is a common trait of hoarders. Bob knew Barb had a problem, but was too old and weak to do anything about it.
Also, Barb didn't start hoarding until later in her life. I'm not sure when 14 Branchland Court became the hoarded mess it is infamous for, but it happened after Chris graduated high school and before Chris was discovered by ED.
Chris's house was relatively clean and showed no signs of hoarding in the pictures of his 18th birthday party. Granted, that was back when he was living in Chesterfield County and not Ruckersville, but if Barb was living with them at the time, she wasn't hoarding yet.
Chris graduated high school in June 2000 and was discovered by ED in October 2007, and given how bad the house was in the first house tour videos back in 2009, I'd wager the hoarding began in earnest at some point in the early 2000's.
If Bob was a true and honest hoarder, we'll never know the extent of it because Barb's uncontrolled hoard overtook the place and any valuable items Bob may have had in his collections were either destroyed in the fire or hocked by Barb.