Children aged __________ must be detained by family court order only.

The correct choice highlights that children aged 11-12 years must be detained by family court order only. This aligns with legal frameworks that focus on the involvement of family courts in cases concerning younger children, especially for those within this age range. At this stage of development, children's legal proceedings emphasize rehabilitation and family involvement rather than punitive measures. Courts typically aim to address the best interests of the child, ensuring that detainment is a decision grounded in the family's circumstances and the child's wellbeing. As children mature past this age bracket, the legal standards and processes often shift towards more conventional juvenile justice protocols, which may not require family court orders for similar age groups.