Final answer:
In Norse mythology, Búr is the grandfather of Odin, making Odin Búr's grandson and underscoring the rich tapestry of divine genealogy in these myths.
Step-by-step explanation:
Odin is the grandson of Bur in Norse mythology. Specifically, Búr is Odin's grandfather, with Búr being the father of Odin's father, Borr. In Norse mythology, the familial connections between gods are of great importance, much like in other mythologies. Búr, a primeval being, is the progenitor of a divine lineage that leads to some of the most central figures in the Norse pantheon. His son, Borr, couples with the giantess Bestla to produce Odin, along with Odin's brothers Vili and Vé. Consequently, Odin, the Allfather and chief among the Æsir, a tribe of gods, is the grandson of Búr.
These relationships are detailed in sources such as the 'Prose Edda', written by Snorri Sturluson in the 13th century, which provides a rich tapestry of Norse creation myths and tales of divine genealogy. Unlike the Egyptian myth of Osiris and his son Horus, wherein Osiris is a direct father, in Norse myth, Búr is an antecedent of Odin rather than a direct parent or a sibling. The Norse narratives underscore the complexity and grand scale of divine kinship, shaping the world's creation and the interplay between gods and giants in shaping the cosmos.