The answer is the supremacy clause.
Hope this helps!
Carry out and enforce laws
Participate in the democratic process. Respect and obey federal, state, and local laws. Respect the rights, beliefs, and opinions of others. ... Pay income and other taxes honestly, and on time, to federal, state, and local authorities.
Yes, it would depend on the nation or state, but yes that 11 year old could be charged with abuse if the level of abuse hits a breaking point. It would also depend on how often this occurs, the severity, and actions taken by the parents to intervene. The more valuable proof would come from signs of abuse, such as trauma or bruising, but a video would suffice the start of an investigation. If you or someone you know is being abused, call 9-11 or 1-800-799-7233 (National Domestic Violence Hotline).
I hope this helps! And please stay safe.
