Besides the true owls, which is the other generally accepted family of owls?

Barn owls (family 'Tytonidae') are one of the two families of owls, the other being the true owls or typical owls, 'Strigidae'. They are medium to large owls with large heads and characteristic heart-shaped faces. They have long, strong legs with powerful talons. They also differ from the 'Strigidae' in structural details relating in particular to the sternum and feet.

The barn owls are a wide-ranging family, although they are absent from northern North America, Saharan Africa, and large areas of Asia. They live in a wide range of habitats from deserts to forests, and from temperate latitudes to the tropics. The majority of the twenty living species of barn-owls are poorly known. Some, like the red owl, have barely been seen or studied since their discovery, in contrast to the common barn-owl, which is one of the best-known owl species in the world. However, some subspecies of the common barn-owl possibly deserve to be separate species but are very poorly known.