Is there funding for children with autism?

I live in Michigan and have a nephew with moderate autism. He's in need of therapy and a few other forms of treatment that I'm unfamiliar with. My brother makes in the 90k-100k range, but he's the sole provider for the household. Also, my sister in-law has various health conditions including MS, lupus (not sure I spelled that right), mixed connective tissue disorder, and arthritis just to name a few. Needless to say, much of their income goes to their medical treatment and medications for my sister in-law. Their insurance doesn't cover much of either of their needs. I know they make a lot, but you'd be surprised how quickly that gets depleted. Does anyone know of any foundations, state funding, or organizations that could help?? Most of the state funding is income based and don't take into consideration that a lot of their money goes to her treatment as well. Any SERIOUS advice would be greatly appreciated!! Thanks!!!!