Good sequel but it just begs for a follow-on as eventually wizarding Britain is going to notice the lack of muggle-born attending Hogwarts, especially compared to the numbers of British magicals taking International OWLS and NEWTS; combine that with declining pureblood (staleblooed!) families when there's really no new blood to mix in and you've got a MoM with a mission to find out what's going on. Of course, considering that the "family" produces intelligent citizens rather than the sheeple of the wizarding world, I suspect that any attempts to force them to join that insular society would be strongly, forcefully, and successfully resisted.