What are the issues related to …

Size of families  - When a poor labourer's income is low, the size of his family will always matter as the money  will not be enough to fulfill the basic needs of his family members if the family is big.
Illiteracy  - The labourer won't be able to send his children to school, As a result they will always remain illiterate.
Poor Health  - There is always a lack of clean water and sanitation facilities for poor people due to which they often get ill.
Malnutrition  - The poor labourers hardly find 'regular' employments (lack of regular job). When they dont have any job, they are left wothout any money due to which they will have nothign to eat and it leads to malnutrition.
Child labour  - When the family's income level is very low, they send their children for work which will raise their income a bit.
Helplessness  - When a member of the family gets ill there is no medical facility at all. So they are really helpless. Especially when the labourer himself gets ill they are more helpless.