Johnson, Cristy A. - Of Revere, December 10. Beloved mother of Tyler of Billerica. Devoted daughter of Daniel T. Johnson of Billerica and the late Theresa (McDonald). Loving sister of Hannah Johnson of Burlington and the late Daniel T. Johnson Jr. Also survived by many loving aunts, uncles and cousins. Funeral from the Dello Russo Funeral Home 306 Main St., MEDFORD, Thursday December 17 at 9 am followed by a funeral mass celebrated in St. Benedict Church, 21 Hathorne St., SOMERVILLE, at 10 AM. Relatives and friends are respectfully invited to attend. Visiting hours Wednesday, 4 - 8 PM. Interment will be private.