Correction

Introduction

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It takes a two miles' walk to go ton London. (expression de la distance)
I don't know where the young lady's little dog is. (attention à l'ordre des adjectifs)
The children's mother will take them to the zoo. (attention au pluriel irrégulier)
He has a two weeks' delay. (expression de la durée)
Your sister's house is absolutely gorgeous. (possesseur animé, règle de base)
Saturne's rings unlike the rings of other planets are very bright. (possesseur non animé mais clairement identifié en début de phrase puis générique dans la deuxième partie de la phrase, d'où l'utilisation de "of")
Our house is one hour's drive from the airport. (expression de la durée)
This is my brothers' car. (possesseur pluriel)
The President's two decisions have surprised everybody. (règle de base)
Dr Kraus's revolutionary ideas have changed medicine. (attention aux possesseurs qui finissant par un "s")