Is it possible for siblings to get along is a question, that can be answered many ways.
Some might say no it is not possible. This is a common response because siblings often seem to fight. Some siblings get into knock down dragouts.
Some would say it is possible. This is a response of people who have seen their children get along. It is also said to be possible if there is an age difference.
I believe with some siblings it is possible and with some it is not. It is possible with siblings who are each other's best friends. Not possible with others.