I think it's just normal for a younger brother to copy most of the things that his older brother does. Hubby said that he did that to his older brother (copy almost everything, and that's why he learned to drive at an early age). I think Kuya must have wanted to get away during those days. Hahaha. I mean, it could get pretty annoying, sometimes.
That's our youngest when he was four months away from being a two year old (he turned two this month).