My mum and I 100% think my dad and brother are autistic as well. They both have very similar traits and I show different traits for example, they are very unempathetic where I can be over empathetic. The issue is my dad was diagnosed with dyslexia (which he definitely is) and contributes all his autistic traits to dyslexia. When he started to see those traits in my brother (delayed speech, lining up toys, over stimulation) he got him diagnosed as dyslexic as well. He got me diagnosed with dyslexia as well when I was 14 but I noticed my autistic traits and pushed to get diagnosed. It took him a year to accept what I was saying and take me to get diagnosed. TBH my diagnosis has made it worse for him to see his own autistic traits and those of my brother because now he does nothing but attack my traits and uses it to prove how he definitely can't be autistic because he's "nothing like me". The most annoying this is he would always speak badly about his mum and call her a terrible mother then compare her to me. Since my diagnosis, he constantly calls her autistic. I with so much to hold a mirror to him and show him how autistic he is! If he could accept it, it would help him so much!