My Mommy is Upset

I have not been a good boy lately. I have been barking up a storm and have been going potty in places I am not suppose to. Instead of being a happy puppy because I got a new brother I have been a big pain in the butt. My mommy is upset with me because I am not behaving. She thought it'd be fun for me to have a playmate and I am not cooperating. I've just been used to having all the attention for the last 6 months and I get upset when my mommies are playing with Buster. He is a good doggie and I know he loves me but I get jealous.