Question: is elrond related to galadriel?
Answer: Galadriel's grandfather (Olwë of Alqualondë) and Elrond's great-great-grandfather (King Elwë Thingol of Doriath) were brothers. Thus, they are second cousins twice removed. Elrond was married to Galadriel's daughter, Celebrían (which also makes Galadriel the grandmother of Arwen, obviously).