Similar activity is obvious, they are brothers in the same time zone and household. My brother and I always wake up within 10 minutes of each other and go to bed within 15. The IP address is because they are brothers,Families tend to have a preferred way to access things. My family is very big fans of Apple devices and we use safari on our phones to access the browser game. As for email address, dammit it probably is the same person’s email due to the fact that he doesn’t want all the spam in his brothers email or his brother may not be comfortable giving his email to online games that often sell the email addresses to advertisers. Dammit I made up an email for myself to play games and I made my brother one for his games that was similar, though he didn’t take a liking to this game. See they did nothing shady as there is only circumstantial evidence. When you have actual proof such as them trading or warring together, or something I implore you to go ahead as he is doing something wrong but as long as you only have your circumstantial evidence it is foolish to ban him.