Kids at contra dances

Normally I enjoy having kids at dances.  Generally, they dance with
their parents and have an inkling of what they're doing.  One of my
fondest memories of dancing came 20+ years ago when I was singled out
by a 9 year old girl to dance with because I swung her so nicely.

That said, a situation arose at a dance a couple of weeks ago
regarding kids and I wondered how other groups would deal with it.

At a special dance (seven hours of dancing with a potluck dinner break
in the middle) a family brought three kids.  Instead of ensuring that
each child danced with an experienced adult, the parents allowed two
kids, ages ~9 and 10, to dance together.

They were together for two dances, both of which had complicated moves
(contra corners, Beckett formations, etc).  In each case, the
complexity was far beyond the kids' abilities and powers of
concentration, with the result that the sets they were in broke down
completely.  The parents ignored the problems they were causing,
though I have to admit they did go home after the second disaster.

In the opinion of my wife and me, the parents were negligent and
shouldn't have allowed the kids to dance together.  At a minimum, they
should have broken them up for the second dance.  As we were new to
the group, we didn't feel it was our place to say anything without
knowing the social mores of the dance.

As I said, I like kids but this was not a positive experience for
anyone.  How do other groups have handle situations like this?