You both can have a family meeting and discusss the importance of money. Making it a family involed project will help encourage participatation and possibly teach or show you something you that you missed in your own finances. I recommend you checkout these references:
"Rich Dad Poor Dad" Robert Kyiosaki
(note): There is a board game that you can play with them to explain the importance without forcing them to read a book.
To find inexpensive books check out.