I don't have an answer to the question, but wanted to comment here to help in other ways. I am the president of International Mosaic Down Syndrome Association. (IMDSA) If this nanny or the parents do not know of our organization, I encourage them to contact us. We can help them with support and information concerning mosaic Down syndrome. Our website is www.imdsa.org
I also write a daily blog on mosaic Down syndrome, Down syndrome, Autism and other disability issues. If you are interested in that, the link is www.mosaicmoments.today.com
Great blog! I will link yours to mine so others can benefit from it!