Flexibility, faith, patience and a sense of community are among attributes Jessica Houk brings to her role as a foster home "mom." The former special education teacher and her husband, Carson High School social studies teacher William Houk, have a 4-year-old son of their own and take on foster children a pair at a time."We're on our fourth pair of siblings," Jessica said during an interview about foster parenting and the things that someone contemplating such a role will need."I think flexibility is a big part," she said when asked what 18 months in foster care has taught her. "We're …