Hi and Welcome to YT. Congrats on your new baby Carly! Hope to see pics of Brody and Carly.
Jersey Boy was 1 1/2 when we brought Brielle home. It took him some time to get use to her. We tried our best to keep him as top dog with attention, treats etc. Now the 2 of them are true brother and sister, they tease each other, tattle on each other,steal toys and treats but then they will snuggle together. Just give it some time and Brody will come around.
BTW Brody and Carly sound just like Jersey and Brielle, around the same size and jersey has energy like Brody.lol