2year with bad temper

My grandson Chance has a bad temper. I am not sure if this is part of the terrible two’s or something else.
Chance did not like the allergist that was examining him, and he fought and screamed at her. He was such in a rage, once, the doctor was done with the examination he got off my lap and threw the seat on the floor that the doctor was sitting on and he tried to turn over the weighing scale too, but it was too heavy for him to move.

Yesterday, we went shopping with my partner B, his son Josh, Chance and I. Chance and I were buying things for the barbecue he had a book to keep him busy. He was extremely happy with us shopping and his book. Then when my partner and Josh showed up he started to throw a fit and he pulled my hair almost out of my head and started to bite me. My partner pulled him off of me; he started to bite him too. It took Chance a while too calm down.

When Chance gets upset he usually wants to bite (me or my partner and my partner kids), pull (my hair), and throw things down that is in his reach. I mean is this normal? I need some input! Or is this something else going on here that needs intrevention!

The amazing thing is that Chance does not do this with his Mom, which is my daughter. My daughter is stunned when I tell her about Chance’s behavior.

You can try the 1-2-3 Method, from “1-2-3 Magic - Easy-To-Learn Parenting Solutions That Work From Dr. Thomas Phelan”, their website http://www.parentmagic.com/.
I’ve heard good reviews from mums using the method, and you can see one example in a Brillkids forum mum blog:
http://raisingethan.wordpress.com/category/parenting/discipline/

My son has different attitudes with different people too. Maybe he knows or feels which people he can influence most or in which moments. Or at least he tries whenever he wants because the results are not always up to his expectations lol

Andrea