Question: Are both Calibanus and Euphorbia members of the Euphorbiaceae family?

Context articles: Euphorbia abyssinica
Calibanus
Euphorbia leucocephala
Euphorbia
Euphorbia antiquorum
Euphorbia pachypodioides
Euphorbia bulbispina
Euphorbia flanaganii
Euphorbia aleppica
Euphorbia leistneri

Euphorbia abyssinica is a species of plant in the Euphorbiaceae family.
Calibanus is a genus of two species of flowering plants, both evergreen succulents from dry areas of northeastern Mexico.
 The APG III classification system places it in the family Asparagaceae, subfamily Nolinoideae (formerly the family Ruscaceae. )
 It was formerly included in the Agavaceae (now Agavoideae) but is now separated from them, for it is polycarpic and dioecious.
 Its name refers to the monster Caliban, an antagonist in Shakespeare's "The Tempest".
Euphorbia leucocephala, with many common names including little Christmas flower, white lace euphorbia, snow bush, snow flake, snows of Kilimanjaro and white Christmas bush is a species of plant in the Euphorbiaceae family.
 It is endemic to Mexico and Mesoamerica.
Euphorbia is a very large and diverse genus of flowering plants, commonly called spurge, in the spurge family (Euphorbiaceae).
 "Euphorbia" is sometimes used in ordinary English to collectively refer to all members of Euphorbiaceae (in deference to the type genus), not just to members of the genus.
 Some euphorbias are commercially widely available, such as poinsettias at Christmas.
 Some are commonly cultivated as ornamentals, or collected and highly valued for the aesthetic appearance of their unique floral structures, such as the crown of thorns plant.
 Euphorbias from the deserts of Southern Africa and Madagascar have evolved physical characteristics and forms similar to cacti of North and South America, so they (along with various other kinds of plants) are often incorrectly referred to as "cacti".
 Some are used as ornamentals in landscaping, because of beautiful or striking overall forms, and drought and heat tolerance.
Euphorbia antiquorum, known as antique spurge and "Euphorbia of the Ancients", is a species of succulent plant in the Euphorbiaceae family.
 It is the type species, and is closely related to the poinsettia−"Euphorbia pulcherrima", native to Mexico.
Euphorbia pachypodioides is a species of plant in the Euphorbiaceae family.
 It is endemic to Madagascar.
 Its natural habitat is rocky areas.
 It is threatened by habitat loss.
 It also has the binomial synonym "Euphorbia antankara" (Leandri, 1946).
Euphorbia bulbispina is a spiny plant of the Euphorbiaceae family.
 It was described by Rauh & Razafindratsira.
 in Euphorbia Journal 7: 31.
 1991.
 It is endemic to a very small area in northern Madagascar where it is found in rock cracks in the Antsiranana district)
Euphorbia flanaganii belongs to the Euphorbiaceae family of plants.
 Due to the breadth of the Euphorbiaceae, little research specific to "E. flanaganii" has been conducted.
 "E. flanaganii" is believed to be closely related to "E. hypogaea" and "E. procumbens", resulting from a common speciation event.
 However, the phylogenetic association between the three species remains relatively unreliable, with values of only 53/.66 attributed to the linkage.
Euphorbia aleppica is a species of plant in the Euphorbiaceae family.
Euphorbia leistneri is a species of succulent plant in the Euphorbiaceae family.
 It is endemic to northwest-Namibia and southwest-Angola near the Kunene river.
 Its natural habitat is subtropical or tropical dry shrubland.
 It is threatened by habitat loss.
 E. leistneri is closely related to Euphorbia monteiri.