The phrase "similar upbringings" means that two or more people were raised in a comparable way, with similar experiences, values, or conditions during their childhood and early years. Full definition
This often includes a common world view through their Aboriginal and Torres Strait Islander identity, a deep sense of obligation to family, and similar upbringings in places of poverty and financial hardship. (moneysmart.gov.au)
The map suggests that patterns of word meaning are consistent between different people's brains, but the team say this might be because they studied a small number of people with a culturally similar upbringing and education. (newscientist.com)
Gen X is a smaller group but they share very similar upbringing and styles of behaviour. (remonline.com)