When i was a kid my mom and i had a code word to let her know when i needed her to say no. For instance if a kid at school asked me to come over and stay the night but i really didnt want to, id call my mama and ask her, and then end it with “please, Mom?” I never call my mama Mom, just Mama or Moomoo, so she would know immediately to say that I was grounded or had too much homework or some other bullshit. We also had a system the other way around, so if i called her to see how her date was going and she needed an out, she would call me babydoll and id tell her i heard scary noises and was frightened and needed her to come home or something.
Anyways, my point is that every family should hqve a system of codes to keep them safe. Go do that.