Many people, especially women, are now leading child-free lifestyles, which means they choose not to have children. They are likely to characterise family in other ways - they may refer to their romantic partners, immediate family, other relatives or friends.
There are several reasons why individuals decide against having children, including:
the rising costs of raising children
concerns about raising children in unstable environments, such as during economic crises or climate change
they want to focus on their career
it may simply not appeal to them!