It's a good shot, but I'd keep your mum's hair in the frame (women tend to spend quite a bit of time on their hair).
Other than that and white balance (which I might have kept as shot because it's so warm and seems to suit the mood), I think going one step back (or zooming out) might have been good too to see them unpacking/holding whatever they were looking at.
It's a nice candid shot, a keeper by all means.