Hi everyone, I probably should have clarified.

The drinks were consumed over the period of around two hours - They came around for some food.

As far as allowing the child to get into the car - My mother had spoken all night about how she was driving, seeing as her partner was drinking. They got into the car without us watching, it wasnt until we ventured out to wave goodbye that we noticed, by which stage they had already reversed out of the driveway and begin turning, at this point I phoned immediately.