Hi Justin, 

It's great that you and your sister respect each other's privacy by not checking each other's phones. This mutual understanding shows a strong sense of trust between you two. Respecting each other's boundaries is an important part of maintaining a healthy relationship within the family. Keep up the good work in respecting and valuing each other's privacy. 

~Teacher Cathy 

For me, I don't watch my sister's cell phone.  

>>For me, I don't check my sister's cell phone. 

Also, my sister doesn't watch my cell phone as well. 

>>My sister doesn't check my cell phone either.