Help forWilliams Syndrome boy in Tucson

We need help with services for an 11 year old boy in Tucson with Williams Syndrome. His mother brought him here from Mexico when was 3 hoping to find medical help for him and found no help - she has limited English which could account for the problems. But he is getting older and older and no medical attention or help. The mother has a visa but the boy is born in Mexico - please any help for this desperate family would be appreciated. The mother is a caregiver for my son who has a C4 spinal cord injury - I know the importance of networking:)