Parents should know that I edit the text to make the content age-appropriate.  As early in the rehearsal process as possible, please have a conversation with me if your student is uncomfortable with a line and I may edit or soften the language.  
However, we are performing Shakespeare, so if you are sensitive about the word "ass" we are not the group for you.  For instance, the character of Bottom in A Midsummer Night's Dream is transformed to look like he has a donkey's head, so there's no getting around the word.