Depression Support Group
Depression is a real and debilitating condition that is often misunderstood by family and friends. Its meaning can range from a prolonged period of sadness to an actual mental illness with specific symptoms. Find and share experiences with others who are going through the same struggles.

Sd...don't quit. It will work out in the end.
Maybe Mum can help by taking less $ for the children. do you get a government subsidy for childcare in your country? Over here parents get paid 20 hrs per week by government for childcare. Mind you over here if a childcare watches more than 5 children per adult that's breaking the law....
So we have different laws.
As to saving money: are you in an apartment or a house? you could put in a garden at a house, and that reduces food costs and helps you eat more healthy too. I will usually have my own chickens because that makes for cheap eggs, and I can generally sell a dozen to someone a week to pay for feed for all the chooks.
When a mother is at home there is a lot of stuff that she can do to save money; she can't earn it maybe but she can save it. If laundry is under control kids don't need so many clothes. You can make good quality foods from scratch because you have time; stewing beef is cheaper than steak but has to be cooked for longer, that sort of thing. Entertaining the children can involve getting their 'help' with chores or making them play dough.
Are there government run services to help? Food stamps or anything you can sign up for?