Jones, A., Gallagher, B., Manby, M., Robertson, O., Schützwohl, M., Berman, A. H., ... & Christmann, K. (2013). Children of prisoners: Interventions and mitigations to strengthen mental health.
The attached booklet (Mental Health Outcome Measures for Children and Young People) has so many scales that measure the mental outcome of children. You can pick the one that fits you study interest. I hope you find this helpful. Good luck in your research journey.
If you cannot open the attached file, you can find it in this link