The episode "Sins of the Father" introduces Worf's long-lost brother Kurn, who is also an orphan of the House of Mogh. Worf's adoptive parents have a biological son, Nikolai Rozhenko, with whom Worf grew up. Nikolai and Worf talk in "Homeward", where it is revealed that Worf will likely have a nephew or niece.
The episode "Sins of the Father" introduces Worf's long-lost brother Kurn, who is also an orphan of the House of Mogh. Worf's adoptive parents hav,e a biological son Nikolai Rozhenko, with whom Worf grew up. Nikolai and Worf talk in "Homeward", where it is revealed that Worf will likely have a nephew or niece.