My preschool aged son got invited to a birthday party last week and I wanted to take him, but I was a bit nervous because he's been acting out lately and I didn't want him throwing a tantrum in public. 
Did you end up taking him?
I did, and he was well behaved luckily! He was definitely not one of the most unruly kids out of the bunch haha.
Is he just naturally unruly or does he have some sort of condition?
Oh no haha he is just like a typical three year old, they all go through these "threenager" ages where they like to challenge you a lot. 
I'm aware of the "terrible two's"  I've never heard of the threenager but, im not surprised to hear of it