Dear Amy,
I hear that you have a younger brother now and you face some problems because of him.Here is my advice for you.
First,you should understand your parents.They have to take care of your younger brother because he is too young to look after himself.
Also,sharing things with others is a happy thing.You need to be dangerous enough to share everything with your brother.
What‘s more,you should try to calm down when your younger brother is crying.You can also close the door of your study,or you can go to your friend’s home to do your homework.
I hope you think my advice is worth taking.
Best wishes!
Lucy