I dont know why this app has so many bad reviews, it has always worked well for me. The positions are sometimes late; ie @ 4pm I will check location and it will only tell me where he was at 2pm. I then ping for the update, but if the other person chooses not to allow, it will nit update position. The 5.0 upgrade is excellent, but still seems to have this problem.
REAL reviewer, not a hater about Family Tracker, v3.0.1