Did anything bad happen to the children?
Pretty sure 12 year old is legal to babysit in most states... 2 days might be a bit of a stretch in terms of time unless you have a relative of neighbor close by/checking in on them, but I don’t know if I’d make a federal case out of it.
I don’t know if I’d personally do it, but a 12 yo and a 9 yo should be able to survive okay for a couple of days.