Relocation often leads to a request to modify parenting time or decision-making. The court evaluates whether changes serve the child’s best interests, with safety as a paramount concern. Statutes direct evaluators and courts to focus on best-interests factors in post-decree and relocation contexts. Evidence about schooling, caregiving history, logistics, and the child’s needs is important. The judge may also consider the child’s preferences when consistent with safety. These standards are reflected in Colorado’s best-interests and post-decree provisions.