She just turned 18 November 15, she’s been seeing him without our knowledge until a family friend told me. But has been seeing him since she was 17 years of age.
A court issues restraining order. If your the boyfriend has committed a crime or has been harassing you, you can apply to the court for one. If your sole reason is you don't want your adult daughter to be dating an older guy, then no you can't get one.
Also, you would only be able to get a restraining order for your own protection, not your daughter's. You don't have any legal grounds to stop your daughter from dating a person of her choice.
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