A stool for supporting an adult and child includes a plurality of floor engaging legs extending substantially vertically and a seat mounted rigidly on the legs. The seat includes a main seating portion arranged horizontally and having a top surface for the adult to sit on and a bottom connected to at least some of the legs. The main seating portion has a rounded perimeter extending through an arc of at least 180°. The seat has a tongue portion integrally attached to the main seating portion and projecting horizontally from one side. The tongue portion has a top surface for the child to sit on and two opposite edges which taper inwardly towards an outer end. The adult and child are able to sit adjacent each other on the stool. In an exemplary version, the main seating portion has a minimum horizontal width of at least 35 cm.