Open Question: i work for a company bigger than wall mart and i needed to leave cuz my brother was dieing they said no?

i work for a big big company and my brother had a heart attack and they said that if i left that when i come back i wouldent have a job and i would have to wait for someone to cover my shift and i stayed for a hour till someone came to finsh my shift i got to the hospital and seen my brother for 30 sec and he died i was to late and then my dm called and told me i was fired and they wont the