my kid is having sex with her boyfriend they are both 15 what will happen if the cops find out or even the school?

The age of consent in Michigan is 16. This puts them both in violation of state laws. Typically, in situations where both are minors at or near the same age, they could be seen as equally culpable (at fault) and may be charged under the law as juveniles. If this happens they will both have to appear in family court with their parents for a ruling on the matter by a family court judge.

If a teacher, or certain other professionals in Michigan have reasonable suspicion that laws are being violated by, or against a minor, mandatory reporting laws may require them to report the matter to police.