Vous allez vous arrêter de parler.
"je vais m'arrêter de parler"
quand allez-vous l'arrêter?
I'm speaking in French = Je parle en français.
That's an odd usage but the gist is" Stop speaking French".
No, it's not correct. You shall say: It's French speaking. For example, you can say: Quebec, it's a French speaking area/region/province.
I am assuming you want to say "Yes, I am speaking French" in French. In that case, it would be: Oui, je parle français.
English speaking Canadians say "Easter" French speaking Canadians say "Pâques"
Stop it! is 'arrête !' or 'arrête ça !' in French.
s'arrêter - un arrêt
Je parle en français.
In French, you would say "your grandmother" as "ta grand-mère" if you are speaking informally, and as "votre grand-mère" if you are speaking formally.
Ca man ca vas - That's how you say (How is it going) in french.