You know, considering the apparent lack of anything resembling a good performance and the fact they're doing that really irritating 'sorry we're so cute' thing from the previous page, I actually don't feel so bad about them getting mugged.
I think that was the difference with the other family that got mugged. This ones were a highly unlikeable bunch that nobody will miss, yet both this bunch and the group of the original story kinda prove why it's better to not give money to a yukkuri, the only difference is that this bunch was lucky that they meet a store clerk that didn't screw them up or kill them in the spot.
The adults also have their grotesque aspects, just see the way the mother eats when they get into the shop, she just lacks the "over energetic" way of the ko's, but seriously, Salesaki really makes his yukkuris plainly an eyesore, and that's probably the intention.