( CNN ) -- Eunice Kennedy Shriver , sister of President Kennedy , is in critical but stable condition in a Massachusetts hospital with her family at her side , her family said Friday . Eunice Kennedy Shriver speaks at a dinner in honor of the Special Olympics in July 2006 . Members of her family flew in to Cape Cod Hospital to be with the 88-year-old , including California Gov . Arnold Schwarzenegger , the husband of her daughter , Maria Shriver , a source told CNN . No further information on her condition was immediately available . The sister of President Kennedy , Bobby Kennedy and Sen. Ted Kennedy , Shriver is renowned in her own right as the founder and honorary chairwoman of the Special Olympics , which helps 3 million people with intellectual disabilities in nearly 200 countries around the world . `` The Special Olympics movement is saddened to hear that our founder , Eunice Kennedy Shriver , is hospitalized . Our thoughts and prayers are with Mrs. Shriver and her family at this time , '' organization President Brady Lum said in a statement Friday . `` Every day , our Special Olympics family continues to work tirelessly around the world to bring her powerful vision to life to change the lives of people with intellectual disabilities , using sports as the catalyst for respect , acceptance and inclusion , '' he said . The Special Olympics grew from Camp Shriver , a summer day camp begun in 1962 in her backyard , where people with intellectual disabilities could explore their capabilities in a variety of sports and physical activities , according to the organization 's Web site .
`` Our thoughts and prayers are with Mrs. Shriver , '' Special Olympics head says . Family flies in to be at her side . Bobby Kennedy is sister of President Bobby Kennedy , Shriver and Sen. Kennedy . She is the founder and honorary chairwoman of Olympics .