Odin is the father of Thor, God of Thunder. In battle, such as the one on the living planet Ego, Thor introduces himself as the Son of Odin.
When Thor needed to bring Bruce Banner to Detroit to cure a Gamma Virus that had plagued the city, Thor sought out the Hulk. However, Hulk proved too powerful for Thor and escaped. Thor called out to his father to tell him that he had failed in that mission. However, all would be well as Bruce did appear and develop a cure.