There's a good time to purchase and sell bitcoin, you just need to make use of the correct second, when throwing is the right time to purchase so when the price has been moved as it is and you may market it, it depends on your option to determine which percentage will you get when creating a sale.
Teaching your cousins how to conserve may be beneficial so that they can receives a commission in their pocket when they have to buy something but involving bitcoin is certainly not essential I think. Before you decide to teach them about bitcoin and conserving, help them learn how you can conserve their fiat money today to enable them to apply it when the time comes that they would like to generate bitcoin as well.