Why always poor with 2 men working in 1 house?
Nearly every show is about money or lack of it. One today was how they were all helping the mother because they thought she had won a holiday for 2 to Spain.
This is a household with two men working full time, and I expect the mother has a pension. OK Olive doesn't work, but what does she need to buy if others are paying bills and mother buys the food? Cooking for lots of people at once is cheaper than them all eating separately. In real life Olive and Arthur would have their own house.