I did not read the whole thread, just the original post, so forgive me if this has alaready been asked.
First of all, Kudos to you for standing up. It was a brave thing to do when facing two ppl who want to hurt you.
Now... is there anyway that you can charge them with assualt? Or stalking of your sister? I know that it might take up your time, and you probably won't win... but the more charges thrown at them, the longer their record gets and when they do finally get convicted of something, hopefully the judge will see the long list of sh!t they did and sentence them longer than if it were just one or two offenses on their record.
Plus, anyone who would pick on a little girl for the shape of her eyes needs to be permanently scarred. Little girls should be told that they are beautiful and precious EVERY day, no matter what... and anyone who would plant seeds of self doubt into an innocent little girl ... fvckheads... need to be ... hmmm... nevermind... can you charge them with something?