I need some help? (Preferably from a parent or an older sibling) What would you do in a situation like this?!?

[Natasha]

Talk to your sister and ask her to stop doing such things. Try to make her understand that this is definitely not the right thing to do especially when the person she is tweeting about is good and also tell her that these false accuses would give her unnecessary attention for a while but family is forever. If she doesn't understand and continues to do so, tell your mom. But ask her not to be harsh on her. Because at this age, she might interpret things wrongly and might go the wrong way which would be problematic. I hope this helps.