"Bad language?" said Tonks, her eyebrows shooting up. "What kind of bad language? The good stuff, or kids's stuff?" If it was the good stuff, they were going to have a very long conversation. And if it was kids's stuff, she'd get a laugh out of it before having a very long conversation with him as well.
She rubbed his back sympathetically. "It's the bad, eh? Well, he's your son. That might be why. It's harder to discipline him or put the fear of god into him, that whole thing. The intimidation factor is down. Plus he has my genes, so I'm sure that doesn't hurt. Has it been getting worse?"