2Some exceptions about Tracking Apps
Although I believe that monitoring a child is not usually ethical, there are cases in which it would be justified to do so. Download your file from here.
If a father or mother has good reason to suspect that their child is suicidal, is involved in violent radicalism or is involved in other activities that threaten their lives or the lives of others, the best thing to do is to infringe on trust, invade privacy and monitor the child.
But these cases are the exception, not the rule. Think twice before following the trail to your children.