Twelve Little Housemates focuses on the characteristics, health hazards, life cycle, feeding habits, transfer, and control of insects that generally live in the house. The manuscript first offers information on the house-flies, and particularly emphasized are the distinguishing characteristics of these insects from other insects, their life cycle, how they can be health hazards, and how they are considered in the medical field. The text also examines the different species of lice and their preferences, including the ways they are transferred and controlled. The book focuses on the appearance, feeding habits, and control of cockroaches. The feeding habits and control of ants and bed-bugs are also discussed. The text also elaborates on the life cycle, appearance, characteristics, and health hazards of spiders, ticks, and gnats. The protection measures and control procedures against these insects are underscored. The manuscript also focuses on fleas and clothes moth. The text is a dependable source of information for readers wanting to be familiar with common insects in the house.