MOTHER - Honey, I'm worried about our son, he's been flippant in class.
(okay - I just put a comma there but it´s small beer, though.)
Yesterday, he dissed his teacher in front of the principal and spat at me when I tried to talk to him about it.
Are we talking about some kind of nonbinary person? If so, you must let us know. I mean, the he-her thing, somehow I would expect he-his.
Plus, perhaps it´s me but I think the use of FATHER-MOTHER would be replaced by Mommy-Daddy/ Mom-Dad, but I am not going to be categorical on that one. Let´s wait for further comments and opinions about it.
Spat at me - but as you are trying to be slangy (apparently), it could be "spat me" (a bit of straying from the grammar but perhaps okay in some colloquial ways).
FATHER - I've also noticed that he lost his cool on me, the other day he was calling me names. I'm going to call him, and we'll swear him right now.
MOTHER - OK.
(again the comma, I think the sentences could be spoken as one piece and would be understood.)
I'm going to call him, and we'll swear him right now.
(this part I didn´t get well, could you elaborate further? It could be in English or Portuguese.)