i'm allistic but i'm multiply disabled in other ways and one of my friends is questioning autism. he fits many of the symptoms but his mother is an anti vaxxer. he has been vaccinated but if he turned out to have autism his mother might not vaccinate his little sister and i'm really worried about it. is there anything i could do?
Ultimately, you don’t have an control over the choices your friend or his mother make.
If your friend is questioning autism but not feeling any need or desire for a professional diagnosis, you can try to steer him away from bringing it up with his mother, at least until his sister is vaccinated. However, if your friend does want to discuss it with his mother, it is his choice to make.
If your friend wants to bring it up with his mother and is willing to have an argument with her about the flaws in the anti vax argument, you could help him to find resources about it and to script some responses to points she might bring up. However, if he does not want to have that argument with her, that is his choice to make.
Depending on your relationship with this friend and his mother, you could also argue with her about it when she brings it up (without bringing in the fact that your friend may be autistic), but you’d have to assess whether that’s a thing that makes sense for your situation or if it would just create tension without helping anything.
I would like to add that if your friend wants to talk to his mother about possibly being autistic/seeking a diagnosis, I would think it would be ok for you to talk to your friend about your concerns. As this is his decision to make, try not to pressure him into anything. However, you could try saying something like the following:
“I know you’ve been questioning if you’re autistic and were thinking about talking to your mom about that. I’m worried that if you are diagnosed with autism, your mom may not vaccinate your sister. Have you considered waiting to talk to your mom about things until after your sister gets her vaccinations?”
Of course, he may need support immediately which would make waiting a bad idea. Whatever his reasons are, respect his decision.