Final answer:
The plaintiff should file the case in a trial court in the jurisdiction where the fall in the supermarket occurred. The defendant should appeal to the U.S. Court of Appeals. The case would be heard in the federal district court of the state where the defendant was arrested. The U.S. Supreme Court is the only court that could decide to hear the case.
Step-by-step explanation:
The plaintiff should file the case in a trial court in the jurisdiction where the fall in the supermarket occurred. Trial courts are the initial courts that handle issues such as personal injury cases like the one described. They have general jurisdiction. In this case, it would be a state trial court, unless the fall occurred on federal property, in which case the case may be filed in a federal trial court.
The defendant should appeal to the U.S. Court of Appeals. The U.S. Court of Appeals is the intermediate appellate court in the federal system. It reviews decisions made by the district courts. Since the defendant is convicted in a federal trial court, they can appeal to the U.S. Court of Appeals.
The case would be heard in the federal district court of the state where the defendant was arrested. Federal district courts are the trial courts of the federal system and have jurisdiction over federal offenses. Since the defendant is charged with kidnapping and taking the child across state lines, it would fall under federal jurisdiction and be heard in a federal district court.
The U.S. Supreme Court is the only court that could decide to hear the case. The U.S. Supreme Court has the authority to review cases from the circuit courts of appeal. If there is a disagreement among the federal circuit courts of appeal over the interpretation of a law, the U.S. Supreme Court may choose to hear the case and provide a final decision.