To the OP, my son was 3.5 when my daughter was born. He pretty much hated me until she was around 18 months (yes, that recently).
Not sure about the 2's vs. the 3's. Robbie was pretty horrid between 2 and 3, however E is showing that she might be in the Terrible Two category...she throws tantrums, etc. He never did that crap.