Your son is a high school sophomore who turned 16 on Jan 23 He is being seduced by a girl who is a high school senior She will be 18 in April Can you prosecute or file a restraining order against her?

Surely, you are just joking about wanting to bring criminal proceedings against a female who is just about a year older than the male, you son, by the way....? Who told you that criminal and civil legal action was a really good remedy for your relationship with you son and his current girlfriend....YOU need to face the possibility that it is altogether possible that it might be very serious and long-termed... See recent literature about fMRIs and long-termed human and other animal relationships....

Civil law? For what?

And he is being seduced by her? Just how much time have you observed the interaction?

A 16 years old male? Do you have any idea how close he is to being able to totally abandon you and your spouse?

(Yes this all needs to be in discussion: I have expressed an opinion. Still I really hate it when people totally screw up their relatioships over long time with their chidren....)