Are you being deliberately obtuse? Big families are fine with me — as long as you don’t force taxpayers to support them. Multi-generational welfare is not a good thing.
Can you see that far into the future? How do you know those children won’t grow up to become productive citizens?
One way to guarantee that they will be “wards of the state” is to force both parents to work to support the children, without a stay at home parent.
As I stated, cheaper living arrangements should be found for them, they should make no demands on where they should live, if it is on others’ dime.