OMG, don't worry and ruin your trip because of what someone else might or might not say. And if someone gives you a dirty look, who cares really ? You'll likely never see them again and they aren't going to matter to you as much as your mother's health is.
If someone is being outright rude, just look at them and smile and say, " I guess you're pretty grateful then that you don't have to be in a position to use one of these". That ought to shut them up pretty good.
Make your trip magical. You're only there for however many days, then you're home and it's over.
Are you really going to let some losers ruin that ? NO!!!! YOU'RE A DIS-ER !!!! I hope your trip is wonderful !