oppositional behavoir

my younger son has become very oppositional. I'm not sure if its an age appropriate thing and hes testing the waters, he is 9.

He has resulted in destroying things in the house (not as bad as his brothers), he might tear down a picture off the wall, not framed, just art work he or is brother done. He also has been 'screaming' so loud when he doesnt get his way. This is not like him. But it seems to have been increasing.

Also, he still has the lying problem, and not sure how we are going to handle that one.

His tantrums dont last long, and once his time out is over, or he moves onto something else, its like a light switch, he is back to his old self again.

My older son, continues to really do well, and loves school. He still has alot of learning problems, but he has come such a long way. I remember when we first met him, he wouldnt hug at all, and just stand there, now its constant, and God forbide you leave the house without hugging him at least 5 times....

Its actually been a pain to be honest, he will chase you down the street in the car until he gets his numerous hugs.....