Sounds like you are doing a good job and you understand each of your childrens feelings....and don't doubt yourself---YOU know what's best, even if your kids don't agree with you at the time. I think it's great that you are disciplining your kids cuz there are lots of parents out there that let them just run wild. My son has some issues similiar to what you are dealing with...since my daughter has autism (severe).
Every time my daughter Abby (almost 3 yrs old) has therapy, my son Dylan (4 years old) totally acts up---being obnoxious, hyper, and loud, jumping around the therapist...it's a zoo sometimes! I explain to him that Abby has autism and she needs us to help her, but it doesn't seem to matter to him. And with the disciplining, it's the same problem you have, my daughter "gets away with more" than her brother because she deals with situations differently, but he's too young to understand that sometimes she can't handle certain situations.
Have you explained to Emmalyn that Eli has autism? Does she understand what it is and how it affects his daily living? Just curious because that could maybe help? Plus one thing I try is to tell Dylan that Abby needs HIS help too, then he feels a little responsibility to help also. And he gets little rewards for when he "helps out" with his sister.
Don't feel bad-- you are doing a great job! Not sure if my comment will help you at all but just remember that there are alot of others out there in similiar situations. :)
We're really struggling at our house with siblings fighting.My kids are close in age as well, and before the docs were completely convinced it was pddnos (they thought he still could have prematurity issues - was 14 wks early), I told them. Felt Jack needed to know.
I told both boys together that Cole "has autism...but just a little bit, not too bad." Jack had just turned 3 and knew Cole didn't pay attention to him, didn't listen to him, was still in pullups & Jack was not, etc. Furthermore, Cole had just escaped out a gap in our fence, and I nearly lost him in a POND.
Anyway, I pointed out what things Cole was excellent at & the things that Jack was excellent at. Then I said Cole could use some help with xyz, and Jack could use help with abc. Brothers help each other, and there was nobody on the face of the earth that loved Jack as much as mommy, daddy, and cole. Cole just has a little bit of autism, so he needs our help. He cannot help it, just like you cannot help that you have blue eyes...its how you guys are, period.
Anyway, your daughter might benefit from "the talk". If she sees kids at school wearing glasses or in special education, or whatever, she knows that people just need extra help in certain areas.
BTW, Jack - then just 3 said - that's okay Mommy. I'll help you take care of Cole - we can BOTH be the big brother. And then he said "I love you, Cole!". Cole smiled, hugged his baby brother, and said I love YOU, Jackie!. We have had absolutely no sibling rivalry since.