[CrimeStopper]

Everyone is right. The school should be aware of the bullies. You would be surprised some of the things that can happen to bullies if the right people know that it's going on. So yes you should tell someone at the school that she talks to the most or even the principal about these bullies. No matter what the issue going on these bullies need to be reported. That right there can fully help your sister. You are being her advocate and voice that she doesn't have.

Also this is nothing that can you control. But you could possible tell the school your thoughts and your sure your parents. But maybe if you sister is functioning at the age of a toddle she should be in the special ed classes. Now there is many reasons as to why children are in special ed, not just for the reason that everyone may think. But if she were in a special ed class the curriculum would be taught more at her level that she can understand. Which in return would let her succeed better academically. It's also getting her around the kids that are more at her level of functioning. Lots of children with Autism and learning disabilities (which if your sister is functioning at a toddler then that is sort of a learning disability for her age) will be in special ed classes. Maybe that would help her. It may not stop the bullies but it would separate her from them for a certain amount of time. But maybe her level of self-esteem could be higher being around people who understand her better that she wont let the bullies bother her as much. Or maybe she should totally switch schools to a more specialized learning school.

I would be very careful about letting others know about her medical issues. She's at a prime age of thirteen that kids start teasing the worst. Even though shes at a toddler level you need to think how it may make her feel if you tell people. That and they may even tease her more if they know more about her. It seems by what you said that it's apparent that she has medical problems. I guess I personally really don't see the point in telling more about them to others. Some of your sisters problems should really just stay within the family. But you should continue to stick up for her like you have been. She's very lucky to have such a caring big bother like you.