<p><b>Justice systems often assume that the participation of a trusted adult compensates for the
</b></p><p>developmental differences young people exhibit when understanding and applying their legal rights.
</p><p>We recruited a community sample of parents with children between the ages of 10-18 years to
</p><p>examine the advice they provided in hypothetical police questioning situations. All participants read
</p><p>scenarios where they imagined their child was being questioned by police, then selected the advice
</p><p>they would give their child. Participants were quasi randomly allocated to the Extra Information (EI)
</p><p>condition (n = 49) or the Business as Usual (BAU) condition (n = 56 ). Those allocated to the EI
</p><p>group watched a video which told them their child’s legal rights, explained these rights to them and
</p><p>explained their role as their child’s nominated person. Those allocated to the BAU group watched a
</p><p>video in which they were informed of their child’s legal rights. Parents then read more scenarios and
</p><p>asked what advice they would give their child. Pre-video advice was problematic with the optimum
</p><p>legal advice being provided 2.85% of the time, and participants advising their child to remain silent
</p><p>13.57% of the time. Advice improved post-video in both groups, with the EI group improving slightly
</p><p>more than the BAU group. Overall, post-video advice to ‘remain silent’ increased significantly, and
</p><p>post-video advice to ‘tell the police everything’ decreased significantly. However, levels of optimum
</p><p>advice post-video remained low with just over half of participants being unable to provide the
</p><p>optimum legal advice for any of the post-video scenarios. Our results point to gaps in parents’
</p><p>understanding of their children’s legal rights. This may prevent children from receiving the full
</p><p>benefit of the extra protections accorded to them by law. Future research should examine parents’
</p><p>advice to their children in actual police interviews to establish the ecological validity of the current
</p><p>study.</p>