Split in three categories:
1/3 goes to kids educational fund
1/6 goes into a fun fund
1/2 goes to long term savings / rainy day / home related

First is self explanatory. Depending on number of kids and stage of life, that could be smaller or become grandkids related.

Second is for vacations, cars, outings, events, occasions, presents, etc. The aim is to not dip into “principal” but invest wisely and use a portion of the return each year to do fun stuff. If you ever have dry spell or income downturn or something, maybe can use that to afford a nice Christmas or vacation if the base income-based budget doesn’t allow it.

Third is essentially the pocket for long term investments. I include home maintenance/repair/remodel as part of this as long as it’s value accretive and not just frivolous. I still would plan to pay mortgage (or rent) out of base budget.Like fun bucket, don’t dip into principal. Just use investment returns. this bucket could be a rain day source though - allowing you to pay mortgage / budget for an unemployment stretch if you had to. If you don’t already own a house, this is you fund for your down payment.