Is it permissible for a six-year-old maternal cousin to enter upon his twenty-year-old maternal cousin while she is bathing and for him to see her 'awrah, under the pretext of him needing to relieve himself in the restroom?

It is not permissible for a child to see his mother's awrah (private parts) or to enter the bathroom while she is naked, based on the Prophet, peace and blessings be upon him, saying: "Guard your awrah except from your wife or what your right hand possesses." Also, revealing the awrah in front of a child contradicts modesty and proper upbringing. Furthermore, there is a command for children who have not reached puberty to seek permission during times when awrah is typically uncovered. Children vary in their perception, and the older the child gets and the wider his perception becomes, the more it becomes necessary to increase concealment from him.