Beer & Weed, Hops & Hemp, Are these two plants related?

Well, yes and no. Both Humulus lupulus and Cannabis sativa are genera of the Cannabaceae family, defined by their similarities in appearance and molecular structure.
HUMULUS LUPULUS
CANNABIS SATIVA

Both plants share organoleptic properties (taste and smell), because they share organic compounds such as terpenes (natural compounds very common in nature such as lemons, pines or lavender), formed of isoprenes, or terpenoids.
Source : https://www.cervezartesana.es/blog/post/cerveza-marihuana-lupulo-cannabis-amigos-o-enemigos.html