was it dried glue already? Or still wet? If it was already a mostly dry chunk and not toxic, they should be able to pass it very easily and there's nothing to worry about blockages unless it was a lot.
Darn kids! yeah, I'd be careful letting them around your babies again! Maybe tell them that they aren't allowed to go near the rat cage when you aren't there if you don't say it's ok and hopefully they will listen.