So my eldest lies ALOT...

She will look you in the eye and lie without even blinking. You could have video footage of her doing the act, show it to her and she will still swear black and blue it wasn't her or she didn't do it.

Even if I give complete immunity to the person if they own up within a certain time period she will still not admit to it and is willing to let her siblings also suffer with a group punishment (for bigger issues like things going missing or items getting broken) if it came to that.

I WILL NOT be lied to, its disrespectful and not acceptable in this house at all.

But I have no idea how to tackle this with her, I am ready to rip my hair out. Yes the majority are white lies and essentially do not hurt anyone, but the way she looks straight at you and says it makes my blood boil.