Mary Adler is a fictional character from the television series Atypical. She is the younger sister of the main character, Sam, who is on the autism spectrum. Mary is portrayed as a supportive sibling who navigates her own challenges while helping her brother. In the show, Mary often provides a voice of reason and understanding within the family dynamic. Her character highlights the importance of family relationships and the impact of autism on those close to individuals on the spectrum. Mary’s interactions with her family showcase the complexities of growing up in a household with diverse needs.