Liar, Liar, pants on fire!!!

what do you do with a 10 year old boy who not only is a constant talker, but a parent signature forger? of course you threaten him with the does this signature match the signature on this emergency card your mom signed? ok then, i'll call her and if she didn't you'll have to see the principal... maybe even the police since its a felony (i'm not sure if that's the truth for this case.... but that besides the point)... then the.... i've never had someone lie to my face to me, i can NEVER trust them again..... i trust all of my students.... and i hope that you aren't the first.... the basic guilt trip. then, you talk to his mom and she says she never signed it and has punished him for lying.... then asks me "but... is he a trouble student?"..... hello!!!!! in my 4 years of teaching i've never had a blatant liar/chronic talker. is he a trouble student?.... a red flag?.... YES!!!! was that a stoopid question? YES!!!!! how do you gently tell a parent you have a talking liar in a gentle, loving way? kids these days. My conviction: i have to love this kid anyway, even if it's a papercut kind of pain/love.... the kind that hurt more than anything else in the whole world. man only 174 more days till summer... but i'm not counting!