My younger brother, who is a single year younger than me is mental.
He does crazy things for no reason, and does the most stupid of things.
He also has really orange hair. Which is unusual, since my Mother has Blonde hair, as do I and my older brother, and my father has a dark brown hair colour.
My older brother is 5 years older than me, currently living at University and is studying Robotics.
If you put my older and younger brother together, you get crazy stuff.
My older brother riles up my younger brother, and he does even weirder things.
My older brother got my younger to pretend to be a dog and eat dog food off of a fire-poker, just because he would.