My paternal grandmother worked for her father who was a photographer in partnership with his brother- in -law, they had a studio in both south London and Marseilles. Great grandfather had lived in France on and off. My grandmother as a young woman, went down to France with her father pre WW1 to assist him in his studio. My paternal grandfather, Maltese, also a photographer, left the confines of his small island to go to France and worked for my great grandfather for a while, which is how my grandparents met. When the war broke out he fought in the British Army and came back to London and set up his own photography studio after he fell out with the great grandfather. My grandparents married and they lived over his studio shop for a while in cramped accommodation, eventually they bought a house in Wimbledon, but that was probably not until the '30s. I don't know what my grandmother did after that because she had children throughout the 20s and 30s, so I imagine she was quite busy being a housewife and mother.
I know my maternal grandmother was some sort of auxiliary in the women's war effort, stationed in Biggin Hill I believe during WW1, I have a picture of her in a uniform. I don't know whether she worked after she had children, my maternal granddad was in the Navy during that war, apparently they met whilst looking in the same shop window so I'm told and married in 1919. I think money was tight and they lived in North London with my grandfather's parents, my great grandfather, who came from Alsace had a factory manufacturing women's clothing, I only recently found out he was actually Jewish, a bit text book in that all that branch of extended family were in the rag trade, his brother was a very wealthy milliner. That great grandfather had several houses, and he let my grandparents live in one half of a house he owned, they lived next door, I don't know what would have become of them if they hadn't had that safety net, they were fairly skint around that time, maternal grandmother's people on one side were poor Irish immigrants and equally poor on the English side of the family. I think they may have both worked for the great grandfather on and off. Eventually, sometime in the 30s they got enough money together to put a deposit down on a house and moved out to Bromley. I don't really remember either of my grandmothers having jobs when I was a child.