 In "Two Bodies in the Lab", in season 1, and in "The Rocker in the Rinse Cycle", in season 5, Brennan and Booth's mutual love for Foreigner's "Hot Blooded" is mentioned; Booth even refers to it as "their song" in "The Rocker in the Rinse Cycle", and it is the first song on the mix tape he makes for her in "The Ghost in the Machine".Booth's grandfather Hank and Bones' father Max expressed approval of their relationship early on, even before Booth and Bones openly admitted that they were more than just professional partners, and Hank and Max incredulously asked Booth if he was gay when he denied that he was romantically involved with Bones.Max, in particular, strongly believed that Booth was the right man for his daughter despite the fact that Booth has had to arrest him a number of times for trying to take the law into his hands to protect Bones.