A 10-year-old Tewksbury girl has found a way to do her part in the fight against cancer. Emily Cashell, whose sister is a cancer survivor, has organized a group of 10 friends and family members who will take part in the Boston Marathon Jimmy Fund Walk on Sept. 8. Participants in the annual event walk all or a portion of the 26.2-mile Boston Marathon route to raise money for the Jimmy Fund, which supports patient care and cancer research at Boston’s Dana-Farber Cancer Institute. Emily was inspired to organize the team by her 8-year-old sister Ashley, who was successfully treated at Dana-Farber’s Jimmy Fund Clinic after being diagnosed with cancer in 2008. Emily was also motivated by the support she has received from the Siblings Program, a Dana-Farber initiative that provides counseling, group activities, and field trips for siblings of Jimmy Fund Clinic patients. Emily’s goal is to raise $10,000 through her team for the cause. She also hopes through her participation in the walk to raise public awareness of the Siblings Program. To register for the walk or to support Emily’s team, go to www.JimmyFundWalk.org.