Answer:
The correct answer is YOU
Explanation:
In the following sentence the subject pronoun is YOU.
When you are speaking about your sister and yourself.
A subject talks about who performs the action, in this case the action is are speaking and this actions is performed by the subject pronoun YOU.
your sister is an exampleof an object, it means who receives the actions and yourself is a reflexive pronoun 
 
        
             
        
        
        
Explanation:
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The lady was not pleased with Scouts apparels and did not approve them. She wanted Scout to be a lady and cover herself in the same way. she also wanted her to interact with the females.  
She wanted the children to learn about their family and their history, and disagreed with their father about the same.
She did not interaction of the children with the non-whites like Walter, and therefore, forbidden Scout and Walter Jr. paying together.