Just on an aside, remember the more you earn, the greater the amount of taxes need to be paid, combined with little or no money from the government for family assistence, child benefits etc. Not saying either opinion is right or wrong, and not commenting on my own personal circumstance (as it's got nothing to do with anyone but me), however if both are working to make that money, then child care costs would need to be factorde in. One of our kids is in childcare at the moment, and we don't qualify for any help, and the cost for one day is around $80.00. So 2 kids for a few hours each day would be around $200.00 per week maybe? So just remember, the more you earn, the higher taxes are paid, due to increasing tax brackets, and the less support from the government.
On the flip side, if they know they have these outgoings, they they should budget accordingly. As we all should.