Why did the china's one child policy mean the children had no brothers and sisters or aunties and uncles?

China's One-Child Policy, implemented in 1979, restricted most families to having only one child in an effort to control population growth. As a result, many families did not have the opportunity to have multiple children, leading to an entire generation growing up as single children. Consequently, this affected the familial structure, as there were no siblings, and fewer extended family members like aunts and uncles, since families could not have more than one child per household. This has had lasting social implications, including a smaller support network for individuals as they grow older.