Quoting B-Baby:" Hi okay so i dont really know how to put all this but ima try my best im 22 and i have two younger ... [snip!] ... how 13 year old boys are... so i donno wht to do should i tell our parents or what ? opinions please im at a losss... "
Eh, he's 13, not 8.
I mean, yeah he is still a kid, but that is what teenage boys do.
Look at naked people, and stuff like that. It's just curiosity.
I would talk to your brother about internet safety, like never give out your name, family names, address, or any info, etc.
But as far as telling his parents, I don't know. It was like a sworn oath between me and my brother to never tell on each other, and we did a lot worse smurf than that.