Assuming a low tuition rate of $4,000/child with six children (well below average) that is $24,000 in tuition in after tax money alone.
If you squeeze your six kids into a tiny apartment, it still is probably $1,000/month.
Food (even cheap food) is at least $800/month ($100 per person).
That’s $45,600 in after tax dollars and you haven’t even touched many other expenses.