My mother was born to a family of eight who lived in a two room cottage with no electricity on the edge of the sea in Ireland. They also had my grandfather's mother living with them so eleven people lived together on a small subsistance farm. They had a donkey and animals and cut turf for winter fuel and for cooking.
Mum's mother boiled water on a range and baked soda bread every day. As a treat one of the children would get the top of my grandad's egg. Mum walked miles to a one roomed village school where she gained a surprisingly high level of literacy and numeracy. Discipline there was harsh as some of the children were fairly wild. The Catholic church instilled values and my mother had good manners and a strict moral code.
The children were hardy as they were out all day and had few health problems except for childhood illnesses like chicken pox - which led later to mum getting shingles.
Given their deprivation, compared with today's luxurious living, you would never have known the family were poor. They were educated and 'civilised' to a high degree despite having no access to secondary schooling compared with many communities living with deprivation around the world.
The children all moved to the UK where they helped each other and prospered.
The children of the five girls and two boys are doing extremely well. They number teachers, nurses, own businessmen and managers. Three grandchildren attended independent schools and two gained grammar school places. Many attended English universities. Two granddaughters gained three A's at A level.
I think the important things for survival and prospering are the values and discipline instilled in youth. In this case the Christian, specifically Catholic, mindset underpinned the paths of my mother's relatives.
As for how the mothers survived, my grandmother found three children very hard to cope with and ran away for a couple of years, had another child and returned to have four more. My mother looked after her siblings while her mother was away.
They were tough in those days.