The three envelopes method is straightforward and adaptable, plus it encourages family participation, which is awesome for fostering an understanding of finances early on!
As for keeping things exciting, one strategy could involve creating a "family money jar" with a transparent container and some creative décor so that it's visually appealing. Each week, the family can add spare change or a set amount from their respective envelopes into this central jar, turning it into a visual representation of their collective financial progress. This could be especially engaging for children, seeing the physical coins pile up and guessing how much is in there.
Perhaps there could also be a reward system tied to the jar. When the jar is filled, everyone gets a special treat - a pizza night, a trip to the movies, or something else that's a fun, shared experience. That way, saving becomes associated with a positive outcome and creates some extra incentive!
It might also be fun to hold "budget meetings" where the whole family discusses their progress, what they've saved, and any challenges faced. This gives everyone a chance to contribute and feel involved in the process while keeping the family's financial goals at the forefront. These meetings could even include some friendly competition to see who's contributing the most or coming up with the best money-saving strategies! A little healthy rivalry can make things exciting.