We are the five boxes of ever-changing size!

Answer the riddles of my brothers three, and you may be allowed to pass for free...

I have no mouth, but my hearing and sight is excellent, and I use it to control the world...what am I?

I create my third brother from nothing but 1's and 0's at my base, and without me, his existence would be nigh...

Without me, my third and fourth brother would be worse off, I have all 5 senses but only a fraction of a fraction of the mind...