Nobody.
I played Manhunt 2 without my brother knowing, and if i were to tell him, he would get pissed.
Only thing i fear is God. Don't fear what can't destroy the soul.
"My brother bought it on his steam account a couple years ago but i don't want to play it then he realized that it's in the recently played section then yell at me." (This is a memechat since i don't have a phone)