Name changed as I don't know if the parent is on here.
Someone I know is leaving their two children alone overnight. The children are 15 and 12, and the parent is going away more than 3 hours' distance away in the car to stay. The childrens' father (divorced) doesn't know. She is away for nearly 24 hours, then the childrens' father picks them up. Eldest child knows where the mother is.
AIBU to think this really isn't ok? Or am I being OTT and it's fine, given that the 15 year old is nearly 16?