The phrase "same upbringing" means that two people or things were raised in a very similar or identical way, usually referring to their childhood experiences and how they were brought up by their parents or guardians.
Sentences with «same upbringing»
Dating someone with the same back ground and same upbringing as you can be dull and boring. (girlsdating.asia)
We share the same upbringing — small companies that are trying to make it.» (canadianbusiness.com)