Knowing the signs and repercussions of unhealthy relationships can help parents intervene if their teen is in an abusive relationship. One of the best warning signs parents have is their intuition. Too often, parents have brushed aside those uncomfortable gut feelings when all along they should have listened to and acted on them. As for those conversations, parents are some of the most influential people in teens' lives. Regardless of all of the sighs, ear plugs and eye rolls, teens do listen. Not only do they listen, they also watch how their parents allow others to treat them. Teens need to know there is a role model who serves as their ally, provides safety and gives them unconditional, non-abusive love – and that person is their parent.
Source : https://health.usnews.com/wellness/for-parents/articles/2017-10-30/would-you-know-if-your-teen-was-in-an-abusive-relationship