Qebshenef is one of the Four Sons of Heru (Horus), a group of netjeri (spirits) associated with the canopic jars that hold the organs of the mummified deceased. The Four Sons also protect the throne of Wesir (Osiris) in the Unseen and assist the deceased through the Duat. Each of the Sons is protected by one of the funerary goddesses and associated with one of the cardinal directions.
Qebshenef, whose name means “cooling his brother (with water),” is hawk-headed and holds the intestines. He is guarded by Serqet (Selkis), the scorpion goddess, and associated with the south.
Imset, whose name means “the kindly one,” is human-headed and wears the nemes headcloth. He holds the liver, is guarded by Aset (Isis), and is associated with the west.
Duamutef, whose name means “praising his mother,” is jackal-headed and holds the stomach. He is guarded by Nit (Neith), the Great He-She, and associated with the north.
Hapy (not Hapi, god of the Nile), whose name means “runner,” is baboon-headed and holds the lungs. He is guarded by Nebt-het (Nephthys) and associated with the east.
While the Four Sons have the above associations in regards to their canopic jars, they also assist the deceased in different ways, including carrying or lifting up the deceased, preparing a ladder into the sky, protecting against attacks and decay, preventing hunger and thirst, bringing the deceased a boat “which Khnum built,” and steering that boat.
The Sons themselves are alternatingly stated to be sons of Aset (Isis) and Heru-wer (Horus the Elder) or Khenty-irty (Horus of Khem), but were also implied to be sons of Heru-sa-Aset (Horus the Younger) by virtue of being the grandchildren of Wesir (Osiris). They’ve also been described as the bau (souls) of Pe (a city in Lower Egypt) and Nekhen (a city in Upper Egypt), along with Heru Himself. In various texts, they’re identified as stars near Ursa Major, as emanations of Heru or as Heru’s bau (souls), and as the king’s “children’s children” (the king being as Wesir, Heru’s own father). They’ve also been identified in spells as the hands, arms, fingernails, and/or feet of the deceased or described accompanying the deceased through the Duat.
Henadology’s article is particularly well-fleshed-out and worth further reading, as my entry here merely summarizes the basics of the Four Sons.