If you have others that delve into your wallet (ie you pull out money for children), work out the boundaries for your wallet and those others. For example, you may agree to pay for all school excursions while the child pays for any food bought that day. Of course they’d be able to take snacks from home if they chose. For younger children or partners who prefer visual aides [& let’s face it, men are more visual :-)], draw 2 circles. In one, place your name and place their name in the other. Then write down in each circle what each person is financially responsible for.