pissed off mom sent brother photos

Since the beginning of my pregnancy my older brother told me that he was concerned for the well being of my child/saying I'd be a shitty parent just to be mean. I forgave him for that. Then when I was about 8 months I had aggression issues with my Pitbull and was going to have her adopted for the fear of my newborn and my brother stated that 'it's a bullshit reason that you're giving her away just because she's aggressive' and pretty much stating the dog's life is more valuable than my baby's (mind you- he has no kids of his own).
After that, I cut all contact with him, wanting nothing to do with him. I'm 3 weeks postpartum and I told my mom if he'd like to see pictures of my son he has to ask me. She sent them anyways and I'm livid. I feel like he deserves in no way to know anything about my son period, regardless of being siblings. 
What would you do in this situation ..... (Sorry, just has been a stressful week😔)