A gate within a gate within a barrier. A first, relatively small gate is engaged within a second, relatively large gate, which is engaged in a barrier for extending across a passageway of a residence. The relatively large gate can be closed to, for example, minimize access of toddlers to the passageway, while the relatively small gate can be opened to, for example, maximize access of small dogs to the passageway. One example of a passageway is the head or bottom of a stairway. The relatively large gate, when closed, minimizes toddlers from falling down or climbing up stairs. The relatively small gate, when open, permits small dogs to walk down or climb up the stairs.