NT daughter is starting to call her twin 'Naughty'

Hello all,

I have 4 year old B/G twins. My daughter is NT, i would say some ''autistic traits'' but nothing that would affect her functioning, just quirks i guess. My son is being assesed for Autism (HF as he is verbal) however his behaviour is somewhat challenging and his twin sister has now realised there are differences and has begun to label him 'naughty'.

I find this quite upsetting and i would desperately like to explain to her they have differences but he is not naughty he just doesnt understand in the same way. To an older sibling i feel this would be a little easier to explain, but how do you explain to a child of the same age?

I try to treat them very fairly and equally but this is an impossible task as their needs are so very different! I have seen many a book but they all seem to start with ''my brother is special''. My daughter would instantly take this as she is not and i just cant do that to her.

Any advice would be so gratefully received, thank you in advance xx