Three-year-old Lively, a San Francisco startup, has been acquired by GreatCall, Inc. of San Diego. Lively has developed a remote monitoring system for seniors to help them age in place. Its safety watch works with a system of passive activity sensors to alert family members and share seniors’ daily routines. Lively will complement GreatCall’s suite of products for active aging, which including GreatCall Splash, Jitterbug5, Touch3 and health, safety and medical apps, including Urgent Care, GreatCall Link, MedCoach and 5Star. Financial terms were not disclosed.