The class decided to watch William together .
However , there is a problem : Mrs. Li ( Rosalind Chao ) ( Wanda 's mother ) needs Wanda to watch her little brother William until she gets off her business call .
The class decided to watch William together .
However , there is a problem : Mrs. Li ( Rosalind Chao ) ( Wanda 's mother ) needs Wanda to watch her little brother William until she gets off her business call .