Big sister

I am a big sister of one cute kid,
though he's only 1 and mean as hell,
He is my brother everyone can tell.

He runs to me when he gets scared,
I'm his shield from mean mister bath.

he started the food fight,
but I played along.
we both got time out,
and at bath time he began to pout.

days at its end time for bed,
a good night kiss then he rests his head.