What law is when a child can say which parent can live with?

The law that allows a child to express a preference about which parent they wish to live with is often referred to as the "best interests of the child" standard, which varies by jurisdiction. In many places, once a child reaches a certain age or maturity level, their wishes may be considered in custody decisions, but the final determination rests with the court. The specific age at which a child's preference is given significant weight can differ, typically ranging from around 12 to 14 years old, depending on local laws. Ultimately, the court aims to ensure the child's overall well-being and stability in its ruling.