Most of us probably have some idea of whether our parents did a good job or not in raising us, but how do you know if someone else had bad parents? And let's be clear here: parenting isn't easy — there's no manual, it's often said — but their particularly bad failures tend to show up later in life in some unexpected ways.
Head on over to the r/AskReddit thread, "What are some common signs that someone grew up with [terrible] parents?" for some illuminating signs.