Isn't John's daughter in her mid-20s now?! They grow up fast...
I think Mick would ring Chris more because it's in his personality to talk and to know what's going on. I can imagine John doing that much less, but still keeping in touch every so often.
It's interesting that around the time of ITM on one of her interview videos Chris said it's Mick and John she thinks of the most, clearly because the association goes all the way back to her sessions on the Peter Green albums and even before that, as a fan / blues musician.