Short introduction to definitions in the field of applied economics, see OECD and WHO publications for details. A living salary is a colloquial phrase, more precisely we should talk about the net equivalised household income. Gender and marital status is irrelevant for the calculation.

Let us assume both household's single earner brings in 15382 €/a (EU-27/28 average net income for 2013). Household 1 with two juveniles and one child is 6688 €/a, poverty. Household 2 remains 15382 €/a.

Pretty low quality question. Of course the salary will not adapt according to individuals expenses and neither will it here in Scandinavia. However, the father will of course be obliged to pay child support. The mother will also receive a monthly allowance for each child. She will also likely be eligible to rent support. So children is a special case, but a living wage doesn't involve that.

How did you think this would actually work?