I have been told about one of these times, but have found that it has happened multiple times. My gfs kid flat out lied her ass off to me a few weeks ago trying to get out of school. She gave me a bullshit story about how when her track meet was canceled due to weather the teachers told them all to just go home and when I called the school to confirm, they told me she is full of it. The kid called back a few minutes later and she stuttered around and danced around it when I called her out and then said "oh yeah, well, that's why I called. They just said go back to class". I of course told her mom everything because until now we had been a team on things. When confronted by us the kid immediately went to tears and cried her way out of it. Since then she keeps going through my shit trying to find some big "gotcha" sort of shit or something. Best she found was that I had a little whiskey a week ago after everyone went to bed because I have had a few deaths in the family and I'm currently trying to navigate the probate court system to sell a relatives estate. She has tried to turn this into a huge issue and has talked crazy amounts of shit about me to her family which has caused a ton of issues between my gf and I. I have always been respectful and always say "yes ma'am" or "no ma'am" and go out of my way to ensure their comfort. This has me worried for her mom (my gf) as the kid's dad is a completely manipulative narcissist who is constantly in and out of jail or prison and while I want to slam the door on this bullshit behavior, I have always tried to respect the wishes of her biological parents. What the fuck do I do???