Is it normal for him to react this way?

I was struggling whether I should talk to my future baby daddy older brother about expecting a child and that he will soon be an uncle.. To my surprise he was excited and all, congratulating me about the baby etc.. I went ahead and told him that his brother isn't ready and not really happy about it.. I also told him that we are not even together..he dint seem to care about all that.. He was just happy not sure why.. I kinda feel relieved that he reacted different from what I expected.. Is the brother's reaction to the baby news normal?