An app for my autistic son to communicate with me instantly

I am a 3rd year high school student and I am currently working on an app for my autistic brother. The app will allow him to instantly communicate with me and other family members. Since my brother has trouble talking, I am thinking of adding different categories for things he needs. Like a category for food, a category for clothes, a category for entertainment, etc. <br><br>I think there could also be a button for my brother to push and it would text me his location so that I could pick him up or get my mom to pick him up. <br><br>One of my friends made an app for the deaf and is also working on an app for the blind so I think it would be awesome to make one for those with autism. <br><br>Does anyone have any more ideas on how to make this app more useful for my brother?