My sister and I made my mom cry!?!?!?!?

-So my mom yesterday said we could get two kittens today since at the pound they were buy one get one free. But today she said we couldn't cause they are not worth it and we r bad children! I have no clue why she all of the sudden said that! She then said if I clean all my closet we will get one. So I did! Then she said we still wouldn't get one! Andnme and my sister have been wanting a kitten for at least 5 years! She always says they are mean and they r not! But then my sister started yelling at her and telling her that she's crazy and scary and saying she is the most selfish person ever! And my mom started crying!!! I felt really bad and kept telling my sister to stop but she wouldn't I tried to apologies to my mom but she told me to get away from her! I don't know what to do for her to forgive me!! Help!Parents have their reasons for everything. Your mom probably has a perfect reason for you not to get a kitten. But your sister was yelling at your mom and calling her names and that's not respectful. You should try to apologize again, and if she tells you to get away from her, tell her that you really feel bad and you want her to feel better, so she should just listen to you. Then explain how sorry you are and explain how your sister just got mad because she really wanted a kitten. Then tell her that's it's okay if she says no, but ask her if she'd reconsider. If she doesn't, just leave it. Maybe she thinks you're not responsible enough for it.