I feel like there is a bit of a contradiction here... You first mentioned how before diving into Bitcoin, you always set aside some money for an emergency fund, and that it is been incredibly helpful for financial challenges we can not predict, which honestly makes a lot of sense… But then later, you are also talking about using that same emergency fund for your child’s school expenses...
Now, school expenses are not exactly an unexpected emergency, they are more of a planned expense you can anticipate months in advance.. So if you start dipping into the emergency fund for planned costs like school expenses, then you might not have it when a real financial challenge comes knocking…. I am not saying your plan is bad sha, but maybe it would be better to keep the emergency fund strictly for true emergencies, and have a separate future needs fund for things like school expenses and all…
I would guess that when you have a child, there are unexpected expenses from a child as well. Meaning, like lets say there is a school trip, and takes a good chunk of money, that would still be unexpected. Doesn't mean they have to go, but it is still nice to give your kids that experience when they are young so it would shape them to be better later in life.
It's important to realize, kids are unexpected expense machines, not just even school, everything in their life is an unexpected expense and you end up with spending more than you calculate. Anyone who has a child can tell you 100% true that you can calculate at the start of the month how much everything costs and make a calculation, and then at the end of the month you realize you spent more than you calculated because of them.