"Smart, poignant, candid... It's a really extraordinary film."

Finding support for families of children with disabilities:

Technical Assistance Alliance for Parent Centers
They are a national network with regional centers, whose information can be found on their main website.

Supported living:

Connections for Information and Resources on Community Living (CIRCL)
The Supported Life Institute
California Supported Living Network

San Francisco/California agencies:

The ARC of San Francisco
Golden Gate Regional Center

US Government Programs:

In Home Support Services
Supplemental Security Income
Section Eight Voucher Program

Mowat Wilson Syndrome:

Mowatwilson.org
Mowat- Wilson Syndrome support group in the UK
PDF document by the Centre for Genetics Education in Sydney, Australia
Wikipedia article on Mowat-Wilson

Some other documentaries related to disability:

The Collector of Bedford Street
Cross Your Eyes Keep Them Wide
Freedom Machines
The Gillian Film
How's Your News
Twitch and Shout
Twisted