but surely if a woman is divorced or widowed or her partner becomes ill her children are economically affected too. (Obviously they are also incredibly emotionally affected but that is unavoidable)
Economic security or lack of it affects the children too. Thus my point is it not just about the mother but the entire family.
If the only earner in the family becomes too ill to work longterm a family can lose their house if they can't afford to pay the rent/mortgage- This would most certainly affect the children.
There are obviously ways to shield against this - insurances etc but even if the home is kept, living standards could be much lower if the remaining partner is unable or unwilling to work.
Obviously things can happen that you can't control and both partners working does not mean that disater won't happen and that things will be economically fine after a divorce/death but if the remaining partner has some way of making a living things can be made slightly easier .
For instance my sister died at 31 years old (SAHM - never worked) my BIL managed to look after the children, keep them in the same school and with their friends in their same surroundings which gave them a stability they would never have had if he had had to move. This exactly what they needed when their mother died.
As it was they family were economically affected as my BIL had to pay for some part time childcare after school (my niece and nephew were 5 and 6 when it happened)but it was not catestrophic
If it had been my BIL who had died my sister left alive this would have been economically much worse. My sister would have had no means to pay the rent and would almost certainly have been in an incredibly precarious position which would have had emotional knock on effects.