Ferguson v. McKiernan is a court case where two people, Ferguson and McKiernan, had a disagreement about a piece of property. They both believed that the property belonged to them and they couldn't come to an agreement on their own, so they went to court.
The court is a place where judges listen to both sides of an argument and make a decision based on the evidence they hear. In this particular case, the judge listened to what Ferguson and McKiernan had to say about the property and looked at any evidence they had to support their claims.
After listening to both sides, the judge made a decision about who the property actually belonged to. The judge's decision was based on the law, which is a set of rules that everyone has to follow.
So, in the end, Ferguson v. McKiernan was just a disagreement between two people that couldn't be resolved on their own, so they went to court and a judge made a decision based on the law.