You get a message that your card was charged for your monthly fee to something you don’t need or want anymore. You meant to cancel the service, but it’s only a few dollars a month, and you always forget until you get the next message you were changed again.
A service that connects to your cards and an app that alerts you when a charge is being made. You have the option to ok it, or cancel this particular transaction or all future ones as well, with a push of one button. You can set a default for when you are not available.
For that problematic moment when you are angry at each other.
Every member of the family has the app installed on their smartphone. When one of you feels that “that” moment has arrived, and there is no point (or they just don’t want) in continuing the argument, they press the button. Everybody’s phone beeps and from now on its “waiting and letting go” time. This continues until all have pressed the “I’m ok now” button (or an agreed upon time has been reached – the length of which was decided when you all installed the app). When all have pressed the button, only then all will get the “all clear” alert.