If my son lives in a residential facility do i have to pay child support to the mother? He lives in MA and I live in NY.

My son suffered a brain aneurysm and as a consequence his impulsivity center was damaged.. He is aggressive and has been in a mental institution for two years. He finally was placed in a residential program in MA. He is a danger to himself and others. His mother continues to collect his disability check and my support. I'd rather not maintain her and forward the support to the May Institute for brain damaged children.. Please advise. Thank you.