Rock and Stone brother! For Karl!

I think my child might be british. Where did I go wrong in all of this??? What steps can I take to save him?
I noticed it back in July when he seemed grumpy for our fourth of july picnic. Since then, he's been steadily getting a south L*ndon accent, drinking tea, and watching soccer. The other day I heard him call one of his friends "bruv" on the phone (which he now calls the TELLY for ♥♥♥♥♥ sake!)

WHAT DO I DO???

G.O.A.T.