I would never call the police on my sibling or parent. I would ask them to stop what they are doing.
taking community policing to a whole new level
Kama amekataa na commission yako!
That boy did not snitch of his own accord. There must be a woman behind the deed, most probably the mum. The bitterness quite points out to it. “Shida yangu hasaa ni hatusaidii kwa family”.
If he is a murderer/rapist/terrorist utanyamazia? Juu if you fail to act, he might endanger the lives of other people in the family.