You just have to tell them about bitcoin and teach them on how to earn in crypto so that they would be interested in it.
People are tend to be interested in something that they might find useful specially when it comes to money we are always looking for a way to earn some extra .
It is best to just tell them that the profit in bitcoin is bigger than the natural profit that they are getting like from their paycheck from their work and for sure, they will get convinced with that thing and they will get curious on the works that they can grab in order to earn some bitcoin and also earn bigger amount of money compare to their source of income.