That depends on how you define what is right. If you define it based on society, then no, the rules wouldn’t change.
If you yourself define the rules, then what is stopping you from changing them?
She will be 24 in 8 years and her brother will be 12 in 8 years. She is currently four times as old which means brother is currently 4.
In US legal system, prosecution must prove the case "beyond reasonable doubt". So there must be a majority of the jury believe the defendant is guilty. In this case, there is no majority so the judge will declare a mis-trial.
Is there answer to choose from? If not, the way television has impacted forensic science, it has glorified the simplicity of it when in reality this is not so. However it has brought a major interest into the scientific field and we know have more people in forensic science than ever before.