Are Cymbidium and Pterocactus both in the Orchidaceae family?
no
Title: Clowesia
Passage: Clowesia is a genus of the Orchidaceae family.  Species of this genus are epiphytic and contain many pseudobulbs with several internodes.  The leaves of this plant are arranged alternatively in two vertical rows on opposite sides of the rachis.  The "Clowesia" has a simple gullet flower that allows for pollination by male euglossine bees.  The flowers are often unisexual and contain a viscidium.
Title: Pterocactus
Passage: Pterocactus (from Greek "pteron", "wing", referring to the saucer-shaped seed of these plants) is a genus of the cactus family (Cactaceae), comprising 9 species.  All "Pterocactus" have tuberous roots and are endemic to South and Western Argentina.  The genus has been given its own tribe, the Pterocacteae.
Title: Cymbidium
Passage: Cymbidium , or boat orchid, is a genus of 52 evergreen species in the orchid family Orchidaceae.  The new Latin genus name is derived from the Latin "cymba" meaning boat.  Its first known use was in 1815.
Pterocactus Cymbidium