When children fall through Massachusetts’ safety net, you hear about it. A legislative committee was recently formed in response to several high profile tragedies involving children under the watch of the Department of Social Services.. But there are still 11-thousand other children who were taken from their biological parents because of abuse or neglect. Since the 1990s, the number of foster families willing to take care of these children has dwindled. And the state has one of the nation’s lowest rates of adoption — about 900 children a year. So when a social worker does find a permanent home for a child, they usually move on quickly to the next case. In the first of a two-part series, WFCR’s Karen Brown reports that some foster parents and advocates are asking the state to stick around longer.