My 5 year old bro might be autistic but mother has not evaluated him yet.

Hello, I have a 5 year brother who I think is autistic but the mom doesnt want to accept it and is taking too long to take him to get an evaluation.
When he is in his environment, he behaves good. However, he only likes to eat yogurt, fries, fish stick, chips, and cookies. His mother gives him lots of milk because he doesn't like to eat anything else. He doesn't like to try any new foods. He asked me once for cake and when I served it he screamed when I was going to give it to him in the mouth, but I asked him if he liked it, and he said yes. But then he would just seat there and not eat it. When I would call his name to ask him something, I had to call his name 3 or more times for him to pay attention to me. The weekend he stayed with me, I had some people coming over, and he started acting all crazy. He started being very loud, jumping on the sofa like crazy and touching the dog, and then he would go back to the sofa again and jump and touch the dog again. He did this lots of times. Also, he started holding me like hugging me, but I was talking to the guests and trying to give them something and I had to tell him in several occasions with a kiss to please let go that I was busy. He never had this type of behavior until new people came to the house. I remember when he was younger he did the same thing to me in a party, and he wouldn't want to listen when told not to do something.
I am really concerned because he is my brother and I can't make the mother do anything. He is supposed to start school on August, is this something that the school will notice and make her evaluate the kid. My brother was recently kicked from the daycare because the teachers said he had a problem concentrating and told the mother to go and evaluate the child. However, she has not done it.
Please any advice will be appreciated.

[Londres70]

It is unfortunate that your mother will not address this.  I can't say this is any Autism though; my son falls under the Autistic spectrum.  

The school will address this if it is a decent school and notify your mother.  

[mylittlebro]

Thank you Londres. Actually it's my step-mother and that's why I can't get through to her because our relationship is not as good. My father just got separated from her so It's really hard to make her understand.
Do you think this could be because of the fact that she doesn't have time for him. He doesnt listen and he only wants to do what he wants when he wants it. He doesnt have boundaries or understands when is appropriate to do something and when not. He doesn't react when you tell him not to do something. I'm hoping this is because she is not really teaching him anything and she just leaves him there watching tv all day and playing his games. She doesn't spend much time with him. It's really sad to say but that is the truth.

[Londres70]

The fact that his mother has very little interaction with him could play a big role or it could be a combination of very little interaction and another problem; I am not so sure.  

Hopefully, the school will intervene.  

What does your father have to say about all this?