People often confuse these with physical custody versus legal custody, but those are different questions. Physical custody is where a child lives day to day. Legal custody is the power to make major decisions about the child's health care, schooling, religion, and general welfare. Sole custody means one parent has that authority alone, or the child primarily lives with that parent, depending on what the court order says. Joint custody means both parents share decision-making, time with the child, or both.

The difference matters because a custody order controls who can act quickly and who must be consulted. With sole legal custody, one parent can usually make major choices without getting the other parent's approval. With joint legal custody, parents are expected to communicate and decide together, which can work well when they cooperate but can create conflict when they do not. Like sudden weather changes on a mountain road, family situations can shift fast, and a clear order helps avoid dangerous confusion.

In Hawaii, courts decide custody under Hawaii Revised Statutes § 571-46 (2024) using the child's best interests. A judge may award sole or joint legal custody, sole or joint physical custody, or a mix of both. Custody can also affect an injury-related matter: if a child is hurt in a crash, the parent with legal custody may have authority to approve treatment, deal with insurers, or help pursue a claim for the child.