Callahan, Joan C., of Somerville, January 16, 2020. Beloved daughter of the late Margaret A. (O’Shea) and Cornelius F. Callahan. Loving sister of Patricia Callahan, her husband Larry Hays of NJ, the late Jean M. Pine and her surviving husband Robert M. Pine, of Arlington. Loving aunt of Daniel Pine, Kevin Pine, both of Arlington and the late Matthew Hays. A funeral mass will be celebrated in St. Raphael Church, 512 High St. Medford, Wednesday, January 22nd at 11 AM. Relatives and friends are respectfully invited to attend. Services will conclude with burial at Holy Cross Cemetery, Malden. Joan's family wold like to offer their sincere thanks to Michelle Clifford for her superb care and companionship that she provided to Joan. To send a message of condolence, please visit www.keefefuneralhome.com.