Why is Hrothgar important to Beowulf?

This chapter establishes the all-important familial relationship between Beowulf's family and Hrothgar. As the person who gave Beowulf's father, Ecgtheow, shelter when he was rejected by his tribe and paid the man-price so that Ecgtheow could rejoin his people, Hrothgar has become an extension of Beowulf's family. In a culture in which tribe and family are one's identity, Beowulf is linked to Hrothgar not by politics but by close family ties.
https://www.owleyes.org/text/beowulf/read/vii