on 70k with two kids and you on nil income
you will get around 51 per kidlet (minimum) a fortnight
with you having no income, depending on how old your youngest is (i'm assuming under 5) you'll get another 138
so that's 240 a fn
if you add rent into the mix, you'll get more ftba and some rent assistance

not sure if the 190 a week is accurate without running the estimator myself, but i'd be thinking at least 120 a week if no rentt, more if you're renting