the rivalry has been horrific since they first met in green hill zone when silent shadow stole sonic.exe's kill when he murdered tails. silent shadow is the son of zalgo. but sonic.exe has never caught up with silent shadow ever. sonic.exe has always was fond of silent shadow he even tries to find his loved ones. yet sonic.exe is to slow for silent shadow but for zalgo creating both of them there basicly brother. yet sonic.exe has been know to protect silent shadow a few times he wants them to be true brother. sonic.exe is the older brother silent shadow is younger than him and the only people that cares for his is bloody painter judge angel clockwork and lazari his younger sister and nina the killer and liu homicide .