<human>: Can you give me the gist of the text in a nutshell?

Ok so this will be my first niece/nephew ever, and I really do care and am very excited to finally have one. The thing is I feel that since I am not the parent or grandparent I don't have an obligation to skip work for the birth of the baby. I told him that if the baby were to be born during work hours I would go to the hospital right away as soon as I got done work. I would also go there during her labor if it were before work but would leave as soon as I had to go in. 

He said that it is everyones responsibility to be there since they are bringing a new permanent member of the family into the world. He said that in everyone elses families the uncles and aunts are there when the babies are born and that I am being selfish if I am not going to be there because of my job. He says he won't think of me as his brother anymore if I don't take off work to be there the moment his child is born.

Is this true? Do aunts and uncles usually go out of their way to be at the hospital when the baby is born by taking off from work when it happens? I just never really thought it was a thing, I most definitely want to be there but if I have work I feel it will have to wait.
<bot>: Brother's having a baby, says I am obligated to be present the moment the baby is born even if it means missing work.